Independent Submission P. Fleming Request for Comments: 7612 Independent Obsoletes: 3712 I. McDonald Category: Informational High North ISSN: 2070-1721 June 2015
Lightweight Directory Access Protocol (LDAP): Schema for Printer Services
Abstract
This document defines a schema, object classes, and attributes, for Printers and print services, for use with directories that support the Lightweight Directory Access Protocol (RFC 4510). This document is based on the Printer attributes listed in Appendix E of "Internet Printing Protocol/1.1: Model and Semantics" (RFC 2911). Additional Printer attributes are based on definitions in "Printer MIB v2" (RFC 3805), "PWG Command Set Format for IEEE 1284 Device ID v1.0" (PWG 5107.2), "IPP Job and Printer Extensions - Set 3 (JPS3)" (PWG 5100.13), and "IPP Everywhere" (PWG 5100.14).
This memo is an Independent Submission to the RFC Editor by the Internet Printing Protocol (IPP) Working Group of the IEEE-ISTO Printer Working Group (PWG), as part of their PWG "IPP Everywhere" (PWG 5100.14) project for secure mobile printing with vendor-neutral Client software.
This document is not an Internet Standards Track specification; it is published for informational purposes.
This is a contribution to the RFC Series, independently of any other RFC stream. The RFC Editor has chosen to publish this document at its discretion and makes no statement about its value for implementation or deployment. Documents approved for publication by the RFC Editor are not a candidate for any level of Internet Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7612.
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Copyright Notice
Copyright (c) 2015 IETF Trust and the persons identified as the document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document.
Table of Contents
1. Introduction ....................................................4 1.1. Relationship to SLP Printer Service ........................4 1.2. Source of LDAP Printer Attributes ..........................4 1.3. Source of LDAP Printer Schema OIDs .........................5 1.3.1. IBM Assignments for RFC 3712 ........................5 1.3.2. IEEE-ISTO PWG Assignments ...........................5 1.4. Rationale for Design Choices ...............................5 1.4.1. Rationale for Using DirectoryString Syntax ..........5 1.4.2. Rationale for Using caseIgnoreMatch .................6 1.4.3. Rationale for Using caseIgnoreSubstringsMatch .......7 2. Conventions Used in This Document ...............................8 2.1. Requirements Language ......................................8 2.2. LDAP Schema Descriptions ...................................8 2.3. Abbreviations ..............................................8 3. Definition of Object Classes ....................................9 3.1. slpServicePrinter .........................................10 3.2. printerAbstract ...........................................10 3.3. printerService ............................................11 3.4. printerServiceAuxClass ....................................12 3.5. printerIPP ................................................12 3.6. printerLPR ................................................12 4. Definition of Attribute Types ..................................13 4.1. printer-uri ...............................................15 4.2. printer-xri-supported .....................................16 4.3. printer-name ..............................................18 4.4. printer-natural-language-configured .......................19 4.5. printer-location ..........................................19 4.6. printer-info ..............................................20 4.7. printer-more-info .........................................21 4.8. printer-make-and-model ....................................21 4.9. printer-ipp-versions-supported ............................22 4.10. printer-multiple-document-jobs-supported .................23 4.11. printer-charset-configured ...............................23 4.12. printer-charset-supported ................................24
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This document defines several object classes to provide Lightweight Directory Access Protocol (LDAP) [RFC4510] applications with flexible options in defining Printer information using an LDAP schema. Classes are provided for defining directory entries with common Printer information as well as for extending existing directory entries with Service Location Protocol Version 2 (SLPv2) [RFC2608], Internet Printing Protocol/1.1 (IPP/1.1) [RFC2911], and lineprinter (LPR) [RFC1179] protocol-specific information.
This memo is an Independent Submission to the RFC Editor by the Internet Printing Protocol Working Group of the IEEE-ISTO Printer Working Group, as part of their Printer Working Group (PWG) "IPP Everywhere" (PWG 5100.14) project for secure mobile printing with vendor-neutral Client software.
The schema defined in this document is technically aligned with the stable IANA-registered 'service:printer:' v2.0 template [SLPPRT20], for compatibility with already-deployed SLPv2 [RFC2608] service advertising and discovery infrastructure. The attribute syntaxes are technically aligned with the 'service:printer:' v2.0 template; therefore, simpler types are sometimes used (for example, 'DirectoryString' [RFC4517] rather than 'labeledURI' [RFC2079] for the 'printer-uri' attribute).
o all of the Printer attributes listed in Appendix E ("Generic Directory Schema") of "Internet Printing Protocol/1.1: Model and Semantics" [RFC2911] that are defined in Section 4.4 ("Printer Description Attributes") of [RFC2911]
o selected Printer attributes defined in "Printer MIB v2" [RFC3805], "PWG Command Set for IEEE 1284 Device ID v1.0" [PWG5107.2], "IPP Job and Printer Extensions - Set 3 (JPS3)" [PWG5100.13], and "IPP Everywhere" [PWG5100.14]
See the table of Printer attributes and source documents in Section 4 ("Definition of Attribute Types") of this document.
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In March 2000, IBM permanently assigned ASN.1 OIDs to all of the object classes and attribute types that were defined in the original LDAP Printer Schema [RFC3712] (see Section 7.2).
In October 2011, IBM permanently delegated the base ASN.1 OID "1.3.18.0.2.24.46" to the IEEE-ISTO PWG for use in any PWG project. In October 2011, the IEEE-ISTO PWG permanently assigned subordinate ASN.1 OIDs for all of the new attribute types defined in this updated LDAP Printer Schema (see Section 7.1).
The attribute syntax 'DirectoryString' (UTF-8 [STD63]) defined in [RFC4517] is specified for several groups of string attributes that are defined in this document:
The UTF-8 encoding supports descriptions in any language, conformant with the IETF Policy on Character Sets and Languages [BCP18].
Note: The printer-natural-language-configured attribute contains a language tag [BCP47] for these description attributes (for example, to support text-to-speech conversions).
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The UTF-8 encoding is compatible with the current IPP/1.1 [RFC2911] definition of the equivalent attributes, most of which have the IPP/1.1 union syntax 'keyword' or 'name'. The keyword attributes defined in this document are extensible by site- specific or vendor-specific 'names' that behave like new 'keywords'.
Note: In IPP/1.1, each value is strongly typed over-the-wire as either 'keyword' or 'name'. This union selector is not preserved in the definitions of these equivalent LDAP attributes.
The EQUALITY matching rule 'caseIgnoreMatch' defined in [RFC4517] is specified for several groups of string attributes that are defined in this document:
1) URI
These URI attributes specify EQUALITY matching with 'caseIgnoreMatch' (rather than with 'caseExactMatch') in order to conform to the spirit of [STD66], which requires case-insensitive matching on the host part of a URI versus case-sensitive matching on the remainder of a URI.
These URI attributes follow existing practice of supporting case-insensitive equality matching for host names in the associatedDomain attribute defined in [RFC4524].
Either equality matching rule choice would be a compromise:
a) case-sensitive whole URI matching can lead to false negative matches and has been shown to be fragile (given deployed client applications that 'pretty up' host names displayed and transferred in URI);
b) case-insensitive whole URI matching can lead to false positive matches, although it is a dangerous practice to publish URI that differ only by case (for example, in the path elements).
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2) Description
Case-insensitive equality matching is more user-friendly for description attributes.
3) Keyword
Case-insensitive equality matching is more user-friendly for keyword attributes.
4) IEEE 1284 Device ID
Case-insensitive equality matching is mandatory for IEEE 1284 Device ID attributes.
1.4.3. Rationale for Using caseIgnoreSubstringsMatch
The SUBSTR matching rule 'caseIgnoreSubstringsMatch' defined in [RFC4517] is specified for several groups of string attributes that are defined in this document:
1) URI
These URI attributes follow existing practice of supporting case-insensitive equality matching for host names in the associatedDomain attribute defined in [RFC4524].
2) Description
Support for case-insensitive substring matching is more user-friendly for description attributes.
3) Keyword
Support for case-insensitive substring matching is more user-friendly for keyword attributes.
4) IEEE 1284 Device ID
Support for case-insensitive substring matching is mandatory for IEEE 1284 Device ID attributes.
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The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].
We define the following LDAP object classes for use with both generic Printer-related information and services specific to SLPv2 [RFC2608], IPP/1.1 [RFC2911], and LPR [RFC1179].
slpServicePrinter - auxiliary class for SLP-registered Printers printerAbstract - abstract class for all Printer classes printerService - structural class for Printers printerServiceAuxClass - auxiliary class for Printers printerIPP - auxiliary class for IPP Printers printerLPR - auxiliary class for LPR Printers
The following are some examples of how applications could choose to use these classes when creating directory entries:
1) Use printerService for directory entries containing common Printer information.
2) Use both printerService and slpServicePrinter for directory entries containing common Printer information for SLP-registered Printers.
3) Use printerService, printerLPR, and printerIPP for directory entries containing common Printer information for Printers that support both LPR and IPP.
4) Use printerServiceAuxClass and object classes not defined by this document for directory entries containing common Printer information. In this example, printerServiceAuxClass is used for extending other structural classes defining Printer information with common Printer information defined in this document.
Refer to Section 4 for the definition of attribute types referenced by these object classes. We use attribute names instead of OIDs in object class definitions for clarity. Some attribute names described in [RFC2911] have been prefixed with 'printer-' as recommended in [RFC2926] and [SLPPRT20].
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This auxiliary class defines information specific to the Service Location Protocol (SLPv2) [RFC2608]. It MAY be used to create new, or extend existing, directory entries with SLP 'service:printer' abstract service type information as defined in [SLPPRT20]. This object class is derived from 'slpService', the parent class for all SLP services, defined in [RFC2926].
This abstract class defines Printer information. It is a base class for deriving other Printer-related classes, such as, but not limited to, classes defined in this document. It defines a common set of Printer attributes that are not specific to any one type of service, protocol, or operating system.
( 1.3.18.0.2.6.255 NAME 'printerService' DESC 'Printer information.' STRUCTURAL SUP printerAbstract MAY ( printer-uri $ printer-xri-supported ) )
This structural class defines Printer information. It is derived from class printerAbstract and thus inherits common Printer attributes. This class can be used with or without auxiliary classes to define Printer information. Auxiliary classes can be used to extend the common Printer information with information specific to the protocol, service, or operating system.
Note: When extending other structural classes with auxiliary classes, printerService SHOULD NOT be used.
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( 1.3.18.0.2.6.256 NAME 'printerIPP' DESC 'Internet Printing Protocol (IPP) information.' AUXILIARY SUP top MAY ( printer-ipp-versions-supported $ printer-ipp-features-supported $ printer-multiple-document-jobs-supported ) )
This auxiliary class defines Internet Printing Protocol (IPP/1.1) [RFC2911] information. It is used to extend structural classes with IPP-specific Printer information.
Note: See "Internet Printing Protocol/1.1: IPP URL Scheme" [RFC3510] and "Internet Printing Protocol (IPP) over HTTPS Transport Binding and the 'ipps' URI Scheme" [RFC7472] for conforming URI for IPP Printers.
The following attribute types are referenced by the object classes defined in Section 3.
The following attribute types reference syntax OIDs defined in Section 3 of [RFC4517] (see Section 5 ("Definition of Syntaxes") below).
The following attribute types reference matching rule names (instead of OIDs) for clarity (see Section 6 below). For optional attributes, if the Printer information is not known, the attribute value SHOULD NOT be set. In the following definitions, referenced matching rules are defined in Section 4 of [RFC4517] and discussed in Section 6 ("Definition of Matching Rules") later in this document.
Note: For compatibility with existing implementations of [RFC3712] and underlying string length limits in [RFC2707], [RFC2911], [RFC3805], [PWG5107.2], [PWG5100.13], and [PWG5100.14], implementations of the attributes defined in this document SHOULD NOT exceed those underlying string length limits (to avoid truncation and false matches).
Note: For interoperability and consistent text display, values of attributes defined in this document (a) SHOULD be normalized as recommended in "Unicode Format for Network Interchange" [RFC5198]; (b) SHOULD NOT contain DEL or any C0 or C1 control characters except for HT, CR, and LF; (c) SHOULD only contain CR and LF characters together (not as singletons); and (d) SHOULD NOT contain HT, CR, or LF characters in names, e.g., printer-name and printer-aliases.
Note: Some of the following attributes are described as 'List of xxx' (using a comma as the member delimiter). Some other attributes are described as 'One of xxx' (single-valued). In all cases, any attribute can have multiple values represented as multiple instances, except where explicitly restricted in syntax to be single-valued.
Note: Values of the string attributes printer-xri-supported and printer-resolution-supported use different field delimiters ('<' and '>', respectively). These two field delimiters are different for compatibility with the corresponding attributes in the IANA- registered SLP 'service:printer:' v2.0 template [SLPPRT20], which was defined before the original LDAP Printer Schema [RFC3712] was written.
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The following table is a summary of the attribute names defined by this document and their corresponding source document names as defined in [RFC2911], [RFC3805], [PWG5107.2], or [PWG5100.13]. Some source attribute names have been prefixed with 'printer-' as recommended in [RFC2926], to address the flat namespace for LDAP identifiers.
( 1.3.18.0.2.4.1140 NAME 'printer-uri' DESC 'A URI supported by this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )
If the printer-xri-supported LDAP attribute is implemented, then this printer-uri value MUST be listed in printer-xri-supported.
See [STD66] for details of URI syntax.
Note: For compatibility with IPP/1.1 [RFC2911], values of this attribute SHOULD NOT exceed 1023 octets in length.
Note: LDAP application clients SHOULD NOT attempt to use malformed URI values read from this attribute. LDAP administrative clients SHOULD NOT write malformed URI values into this attribute.
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Note: See "Internet Printing Protocol/1.1: IPP URL Scheme" [RFC3510] and "Internet Printing Protocol (IPP) over HTTPS Transport Binding and the 'ipps' URI Scheme" [RFC7472] for conforming URI for IPP Printers.
Note: For SLP-registered Printers, the LDAP printer-uri attribute SHOULD be set to the value of the SLP-registered URL of the Printer, for interworking with SLPv2 [RFC2608] service discovery.
Note: See Sections 1.4.1, 1.4.2, and 1.4.3 for rationale for design choices.
Note: See the note in Section 4 about the different field delimiters used in the printer-xri-supported and printer-resolution-supported attributes ('<' and '>', respectively), chosen for compatibility with the IANA-registered SLP 'service:printer:' v2.0 template [SLPPRT20].
Note: Multiple values for this attribute are represented as multiple instances of this attribute.
See [STD66] for details of URI syntax.
Note: For compatibility with IPP/1.1 [RFC2911], values of this attribute SHOULD NOT exceed 1023 octets in length.
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Note: LDAP application clients SHOULD NOT attempt to use malformed URI values read from this attribute. LDAP administrative clients SHOULD NOT write malformed URI values into this attribute.
Note: This attribute is based on the IPP/1.1 [RFC2911] attributes 'printer-uri-supported', 'uri-authentication-supported', and 'uri-security-supported' (called the 'Three Musketeers' because they are parallel, ordered attributes). This attribute unfolds those IPP/1.1 attributes and thus avoids the ordering (and same number of values) constraints of the IPP/1.1 separate attributes.
A missing 'auth' field SHOULD be interpreted to mean 'none'. Per IPP/1.1 [RFC2911], "IPP Job and Printer Extensions - Set 3 (JPS3)" [PWG5100.13], and the IANA IPP registry [IANAIPP], defined values of the 'auth' field include:
'none' (no authentication for this URI) 'requesting-user-name' (from operation request) 'basic' (HTTP/1.1 Basic [RFC2617] and [RFC7235]) 'digest' (HTTP/1.1 Digest [RFC2617] and [RFC7235]) 'certificate' (X.509 Certificate [RFC5280] and [RFC6818]) 'negotiate' (HTTP/1.1 Negotiate [RFC4559])
The 'certificate' value refers to the IPP Client certificate extracted from the TLS session.
A missing 'sec' field SHOULD be interpreted to mean 'none'. Per IPP/1.1 [RFC2911] and the IANA IPP registry [IANAIPP], defined values of the 'sec' field include:
'none' (no security for this URI) 'ssl3' (Netscape's Secure Socket Layer protocol (SSL3)) 'tls' (IETF TLS, [RFC5246])
Note: The syntax and delimiter for this attribute are aligned with the equivalent attribute in the 'service:printer:' v2.0 template [SLPPRT20]. Whitespace is permitted after (but not before) the delimiter '<'.
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Note: See "Internet Printing Protocol/1.1: IPP URL Scheme" [RFC3510] and "Internet Printing Protocol (IPP) over HTTPS Transport Binding and the 'ipps' URI Scheme" [RFC7472] for conforming URI for IPP Printers.
Note: See Sections 1.4.1, 1.4.2, and 1.4.3 for rationale for design choices.
( 1.3.18.0.2.4.1135 NAME 'printer-name' DESC 'The site-specific administrative name of this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )
Values of this attribute SHOULD be specified in the language specified in printer-natural-language-configured (for example, to support text-to-speech conversions), although the Printer's name MAY be specified in any language.
Note: For compatibility with IPP/1.1 [RFC2911], values of this attribute SHOULD NOT exceed 255 octets in length.
Note: This name can be the last part of the Printer's URI, or it can be completely unrelated. This name can contain characters that are not allowed in a conventional URI (see [STD66]).
Note: For interoperability, values of this attribute (a) SHOULD be normalized as recommended in "Unicode Format for Network Interchange" [RFC5198]; and (b) SHOULD NOT contain DEL or any C0 or C1 control characters.
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( 1.3.18.0.2.4.1119 NAME 'printer-natural-language-configured' DESC 'The configured natural language for LDAP attributes of syntax DirectoryString (UTF-8) in this directory entry.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )
Also, a possible natural language for IPP protocol string attributes set by operator, system administrator, or manufacturer. Also, the (declared) natural language of the printer-name, printer-location, printer-info, and printer-make-and-model attributes of this Printer.
Values of language tags MUST conform to "Tags for Identifying Languages" [BCP47]. For example:
'en-us' (English as spoken in the US) 'fr-fr' (French as spoken in France)
Note: For compatibility with IPP/1.1 [RFC2911], values of this attribute SHOULD NOT exceed 63 octets in length.
Note: For compatibility with IPP/1.1 [RFC2911], language tags in this attribute SHOULD be lowercase normalized.
( 1.3.18.0.2.4.1136 NAME 'printer-location' DESC 'The physical location of this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )
For example:
'Room 123A' 'Second floor of building XYZ'
Note: For compatibility with IPP/1.1 [RFC2911], values of this attribute SHOULD NOT exceed 127 octets in length.
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Note: For interoperability and consistent text display, values of this attribute (a) SHOULD be normalized as recommended in "Unicode Format for Network Interchange" [RFC5198]; (b) SHOULD NOT contain DEL or any C0 or C1 control characters except for HT, CR, and LF; and (c) SHOULD only contain CR and LF characters together (not as singletons).
( 1.3.18.0.2.4.1139 NAME 'printer-info' DESC 'Descriptive information about this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )
For example:
'This Printer can be used for printing color transparencies for HR presentations'
'Out of courtesy for others, please print only small (1-5 page) jobs at this Printer'
'This Printer is going away on July 1, 1997; please find a new Printer'
Note: For compatibility with IPP/1.1 [RFC2911], values of this attribute SHOULD NOT exceed 127 octets in length.
Note: For interoperability and consistent text display, values of this attribute (a) SHOULD be normalized as recommended in "Unicode Format for Network Interchange" [RFC5198]; (b) SHOULD NOT contain DEL or any C0 or C1 control characters except for HT, CR, and LF; and (c) SHOULD only contain CR and LF characters together (not as singletons).
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( 1.3.18.0.2.4.1134 NAME 'printer-more-info' DESC 'A URI for more information about this specific Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )
For example, this could be an HTTP URI referencing an HTML page accessible to a Web Browser. The information obtained from this URI is intended for end user consumption.
See [STD66] for details of URI syntax.
Note: For compatibility with IPP/1.1 [RFC2911], values of this attribute SHOULD NOT exceed 1023 octets in length.
Note: LDAP application clients SHOULD NOT attempt to use malformed URI values read from this attribute. LDAP administrative clients SHOULD NOT write malformed URI values into this attribute.
Note: See Sections 1.4.1, 1.4.2, and 1.4.3 for rationale for design choices.
( 1.3.18.0.2.4.1138 NAME 'printer-make-and-model' DESC 'Make and model of this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )
Note: For compatibility with IPP/1.1 [RFC2911], values of this attribute SHOULD NOT exceed 127 octets in length.
Note: The Printer manufacturer MAY initially populate this attribute.
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Note: For interoperability and consistent text display, values of this attribute (a) SHOULD be normalized as recommended in "Unicode Format for Network Interchange" [RFC5198]; (b) SHOULD NOT contain DEL or any C0 or C1 control characters except for HT, CR, and LF; and (c) SHOULD only contain CR and LF characters together (not as singletons).
( 1.3.18.0.2.4.1133 NAME 'printer-ipp-versions-supported' DESC 'Comma-delimited list of IPP versions supported by this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
For example:
'1.1,2.0'
Note: Length overflow in values of this attribute MUST be handled by multiple instances of this attribute, i.e., individual comma-delimited list members MUST NOT be truncated.
The IPP protocol version(s) MUST include major and minor versions, i.e., the exact version numbers for which this Printer implementation meets the IPP version-specific conformance requirements as registered in the IANA IPP registry [IANAIPP].
( 1.3.18.0.2.4.1132 NAME 'printer-multiple-document-jobs-supported' DESC 'Indicates whether or not this Printer supports more than one document per job.' EQUALITY booleanMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.7 SINGLE-VALUE )
( 1.3.18.0.2.4.1109 NAME 'printer-charset-configured' DESC 'The configured charset for IPP protocol values of error and status messages generated by this Printer.' EQUALITY caseIgnoreMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )
Also, a possible charset for IPP protocol string attributes set by operator, system administrator, or manufacturer. For example:
'utf-8' (ISO 10646/Unicode in UTF-8 transform [STD63]) 'iso-8859-1' (ISO Latin1)
Values of charset tags SHOULD be defined in the IANA registry of Character Sets [IANACHAR] (see also [BCP19]), and the '(preferred MIME name)' SHOULD be used as the charset tag in this attribute.
Note: For compatibility with IPP/1.1 [RFC2911], values of this attribute SHOULD NOT exceed 63 octets in length.
Note: For compatibility with IPP/1.1 [RFC2911], charset tags in this attribute SHOULD be lowercase normalized.
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( 1.3.18.0.2.4.1131 NAME 'printer-charset-supported' DESC 'One of the charsets supported for IPP protocol values of IPP string attributes that correspond to attributes of syntax DirectoryString (UTF-8) for this directory entry.' EQUALITY caseIgnoreMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
For example:
'utf-8' (ISO 10646/Unicode in UTF-8 transform [STD63]) 'iso-8859-1' (ISO Latin1)
Note: Multiple values for this attribute are represented as multiple instances of this attribute.
Values of charset tags SHOULD be defined in the IANA registry of Character Sets [IANACHAR] (see also [BCP19]), and the '(preferred MIME name)' SHOULD be used as the charset tag in this attribute.
Note: For compatibility with IPP/1.1 [RFC2911], values of this attribute SHOULD NOT exceed 63 octets in length.
Note: For compatibility with IPP/1.1 [RFC2911], charset tags in this attribute SHOULD be lowercase normalized.
( 1.3.18.0.2.4.1137 NAME 'printer-generated-natural-language-supported' DESC 'One of the natural languages supported for LDAP attributes of syntax DirectoryString (UTF-8) in this directory entry.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
Values of language tags SHOULD conform to "Tags for Identifying Languages" [BCP47]. For example:
'en-us' (English as spoken in the US) 'fr-ca' (French as spoken in Canada)
Note: Multiple values for this attribute are represented as multiple instances of this attribute.
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Note: For compatibility with IPP/1.1 [RFC2911], values of this attribute SHOULD NOT exceed 63 octets in length.
Note: For compatibility with IPP/1.1 [RFC2911], language tags in this attribute SHOULD be lowercase normalized.
( 1.3.18.0.2.4.1130 NAME 'printer-document-format-supported' DESC 'One of the source document formats that can be interpreted and printed by this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
Values of document formats SHOULD be MIME media types defined in the IANA registry of MIME Media Types [IANAMIME] (see also [BCP13]).
( 1.3.18.0.2.4.1129 NAME 'printer-color-supported' DESC 'Indicates whether or not this Printer is capable of any type of color printing at all, including highlight color.' EQUALITY booleanMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.7 SINGLE-VALUE )
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( 1.3.18.0.2.4.1128 NAME 'printer-compression-supported' DESC 'Comma-delimited list of compression algorithms supported by this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
For example:
'none' 'deflate,gzip'
Note: Length overflow in values of this attribute MUST be handled by multiple instances of this attribute, i.e., individual comma-delimited list members MUST NOT be truncated.
Note: For compatibility with IPP/1.1 [RFC2911], values of this attribute SHOULD NOT exceed 255 octets in length.
Values defined in IPP/1.1 [RFC2911] and recorded in the IANA IPP registry [IANAIPP] include:
'none' (no compression is used) 'deflate' (public domain ZIP described in [RFC1951]) 'gzip' (GNU ZIP described in [RFC1952]) 'compress' (UNIX compression described in [RFC1977])
( 1.3.18.0.2.4.1127 NAME 'printer-pages-per-minute' DESC 'The nominal number of pages per minute that can be output by this Printer.' EQUALITY integerMatch ORDERING integerOrderingMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )
This attribute is informative, not a service guarantee. Typically, it is the value used in marketing literature to describe this Printer -- for example, the value for a simplex or black-and-white print mode.
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( 1.3.18.0.2.4.1126 NAME 'printer-pages-per-minute-color' DESC 'The nominal number of color pages per minute that can be output by this Printer.' EQUALITY integerMatch ORDERING integerOrderingMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )
This attribute is informative, not a service guarantee. Typically, it is the value used in marketing literature to describe this Printer.
( 1.3.18.0.2.4.1125 NAME 'printer-finishings-supported' DESC 'Comma-delimited list of finishing operations supported by this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
For example:
'staple' 'staple,punch,bind'
Note: Length overflow in values of this attribute MUST be handled by multiple instances of this attribute, i.e., individual comma-delimited list members MUST NOT be truncated.
Note: For compatibility with IPP/1.1 [RFC2911], values of this attribute SHOULD NOT exceed 255 octets in length.
Values defined in IPP/1.1 [RFC2911] and recorded in the IANA IPP registry [IANAIPP] include:
( 1.3.18.0.2.4.1124 NAME 'printer-number-up-supported' DESC 'Maximum number of print-stream pages that can be imposed upon a single side of an instance of a selected medium by this Printer.' EQUALITY integerMatch ORDERING integerOrderingMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )
For example:
'1' '4'
Note: Values of this attribute differ from the corresponding IPP attribute, in that only the maximum number-up is mapped from the corresponding IPP attribute 'number-up-supported' defined in [RFC2911].
( 1.3.18.0.2.4.1123 NAME 'printer-sides-supported' DESC 'Comma-delimited list of impression sides (one or two) and the two-sided impression rotations supported by this Printer.' EQUALITY caseIgnoreMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
For example:
'one-sided' 'one-sided,two-sided-short-edge'
Note: Length overflow in values of this attribute MUST be handled by multiple instances of this attribute, i.e., individual comma-delimited list members MUST NOT be truncated.
Note: For compatibility with IPP/1.1 [RFC2911], values of this attribute SHOULD NOT exceed 255 octets in length.
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Values defined in IPP/1.1 [RFC2911] and recorded in the IANA IPP registry [IANAIPP] are:
( 1.3.18.0.2.4.1122 NAME 'printer-media-supported' DESC 'One of the names/sizes/types/colors of the media supported by this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
Values SHOULD conform to "PWG Media Standardized Names 2.0 (MSN2)" [PWG5101.1].
Note: For compatibility with IPP/1.1 [RFC2911], values of this attribute SHOULD NOT exceed 255 octets in length.
Values of standardized media size names defined in [PWG5101.1] and recorded in the IANA IPP registry [IANAIPP] include:
'na_letter_8.5x11in' 'iso_a4_210x297mm'
Values of standardized media types defined in [PWG5101.1] and recorded in the IANA IPP registry [IANAIPP] include:
'envelope' 'stationery'
Values of standardized media colors defined in [PWG5101.1] and recorded in the IANA IPP registry [IANAIPP] include:
'white' 'blue'
Note: Multiple values for this attribute are represented as multiple instances of this attribute.
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( 1.3.18.0.2.4.1117 NAME 'printer-media-local-supported' DESC 'One of the site-specific media supported by this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
Values SHOULD conform to "PWG Media Standardized Names 2.0 (MSN2)" [PWG5101.1].
( 1.3.18.0.2.4.1121 NAME 'printer-resolution-supported' DESC 'One of the resolutions supported for printing documents by this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
Each resolution value MUST be a string containing three fields:
1) Cross-feed direction resolution (positive integer);
2) Feed direction resolution (positive integer);
3) Unit -- 'dpi' (dots per inch) or 'dpcm' (dots per centimeter).
Each resolution field MUST be delimited by '>', with optional trailing whitespace. For example:
'300> 300> dpi>' '600> 600> dpi>'
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Note: See the note in Section 4 about the different field delimiters used in the printer-xri-supported and printer-resolution-supported attributes ('<' and '>', respectively), chosen for compatibility with the IANA-registered SLP 'service:printer:' v2.0 template [SLPPRT20].
Note: Multiple values for this attribute are represented as multiple instances of this attribute.
Note: This attribute is based on 'printer-resolution-supported' defined in IPP/1.1 [RFC2911] with a complex encoding derived from 'prtMarkerAddressabilityFeedDir', 'prtMarkerAddressabilityXFeedDir', and 'prtMarkerAddressabilityUnit' defined in "Printer MIB v2" [RFC3805] (which have integer encodings).
Note: The syntax and delimiter for this attribute are aligned with the equivalent attribute in the 'service:printer:' v2.0 template [SLPPRT20]. Whitespace is permitted after (but not before) the delimiter '>'.
( 1.3.18.0.2.4.1120 NAME 'printer-print-quality-supported' DESC 'Comma-delimited list of print qualities supported for printing documents on this Printer.' EQUALITY caseIgnoreMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
For example:
'unknown' 'draft,normal,high'
Note: Length overflow in values of this attribute MUST be handled by multiple instances of this attribute, i.e., individual comma-delimited list members MUST NOT be truncated.
Values defined in IPP/1.1 [RFC2911] and recorded in the IANA IPP registry [IANAIPP] include:
'draft' 'normal' 'high'
Note: The value 'unknown' MUST only be reported if the corresponding IPP attribute is not present, i.e., the value 'unknown' is an artifact of this LDAP mapping.
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( 1.3.18.0.2.4.1110 NAME 'printer-job-priority-supported' DESC 'Indicates the number of job priority levels supported by this Printer.' EQUALITY integerMatch ORDERING integerOrderingMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )
An IPP/1.1 [RFC2911] conformant Printer, which supports job priority, always supports a full range of priorities from '1' to '100' (to ensure consistent behavior); therefore, this attribute describes the 'granularity' of priority supported. Values of this attribute are from '1' to '100'.
( 1.3.18.0.2.4.1118 NAME 'printer-copies-supported' DESC 'The maximum number of copies of a document that can be printed as a single job on this Printer.' EQUALITY integerMatch ORDERING integerOrderingMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )
A positive value indicates the maximum supported copies. A value of '0' indicates no maximum limit. A value of '-1' indicates 'unknown'.
Note: The syntax and values for this attribute are aligned with the equivalent attribute in the 'service:printer:' v2.0 template [SLPPRT20].
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( 1.3.18.0.2.4.1111 NAME 'printer-job-k-octets-supported' DESC 'The maximum size of an incoming print job that this Printer will accept, in kilobytes (1,024 octets).' EQUALITY integerMatch ORDERING integerOrderingMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )
A positive value indicates the maximum supported job size. A value of '0' indicates no maximum limit. A value of '-1' indicates 'unknown'.
Note: The syntax and values for this attribute are aligned with the equivalent attribute in the 'service:printer:' v2.0 template [SLPPRT20].
( 1.3.18.0.2.4.1112 NAME 'printer-current-operator' DESC 'The identity of the current human operator responsible for operating this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )
The value of this attribute SHOULD include information that would enable other humans to reach the operator, such as a telephone number.
Note: For interoperability and consistent text display, values of this attribute (a) SHOULD be normalized as recommended in "Unicode Format for Network Interchange" [RFC5198]; (b) SHOULD NOT contain DEL or any C0 or C1 control characters except for HT, CR, and LF; and (c) SHOULD only contain CR and LF characters together (not as singletons).
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( 1.3.18.0.2.4.1113 NAME 'printer-service-person' DESC 'The identity of the current human service person responsible for servicing this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )
The value of this attribute SHOULD include information that would enable other humans to reach the service person, such as a telephone number.
Note: For interoperability and consistent text display, values of this attribute (a) SHOULD be normalized as recommended in "Unicode Format for Network Interchange" [RFC5198]; (b) SHOULD NOT contain DEL or any C0 or C1 control characters except for HT, CR, and LF; and (c) SHOULD only contain CR and LF characters together (not as singletons).
( 1.3.18.0.2.4.1114 NAME 'printer-delivery-orientation-supported' DESC 'Comma-delimited list of delivery orientations of pages as they are printed and ejected supported by this Printer.' EQUALITY caseIgnoreMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
For example:
'unknown' 'face-up,face-down'
Values defined in "Printer MIB v2" [RFC3805] for prtOutputPageDeliveryOrientation are:
'face-up' 'face-down'
Note: The value 'unknown' MUST only be reported if the corresponding Printer MIB attribute is not present, i.e., the value 'unknown' is an artifact of this LDAP mapping.
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Note: The syntax and values for this attribute are aligned with the equivalent attribute in the 'service:printer:' v2.0 template [SLPPRT20].
( 1.3.18.0.2.4.1115 NAME 'printer-stacking-order-supported' DESC 'Comma-delimited list of stacking orders of pages as they are printed and ejected supported by this Printer.' EQUALITY caseIgnoreMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
Values defined in "Printer MIB v2" [RFC3805] for prtOutputStackingOrder are:
'first-to-last' 'last-to-first'
Note: The value 'unknown' MUST only be reported if the corresponding Printer MIB attribute is not present, i.e., the value 'unknown' is an artifact of this LDAP mapping.
Note: The syntax and values for this attribute are aligned with the equivalent attribute in the 'service:printer:' v2.0 template [SLPPRT20].
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( 1.3.18.0.2.4.1116 NAME 'printer-output-features-supported' DESC 'Comma-delimited list of output features supported by this Printer.' EQUALITY caseIgnoreMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
Note: Length overflow in values of this attribute MUST be handled by multiple instances of this attribute, i.e., individual comma-delimited list members MUST NOT be truncated.
Values defined in "Printer MIB v2" [RFC3805] for prtOutputBursting, prtOutputDecollating, prtOutputPageCollated, and prtOutputOffsetStacking are:
Note: The value 'unknown' MUST only be reported if the corresponding Printer MIB attributes are not present, i.e., the value 'unknown' is an artifact of this LDAP mapping.
Note: The syntax and values for this attribute are aligned with the equivalent attribute in the 'service:printer:' v2.0 template [SLPPRT20].
Note: Implementations MAY support other values.
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( 1.3.18.0.2.4.1108 NAME 'printer-aliases' DESC 'One of the site-specific administrative names of this Printer in addition to the value specified for printer-name.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
Values of this attribute SHOULD be specified in the language specified in printer-natural-language-configured (for example, to support text-to-speech conversions), although the Printer's alias MAY be specified in any language.
Note: Multiple values for this attribute are represented as multiple instances of this attribute.
Note: For compatibility with IPP/1.1 [RFC2911], values of this attribute SHOULD NOT exceed 255 octets in length.
Note: For interoperability, values of this attribute (a) SHOULD be normalized as recommended in "Unicode Format for Network Interchange" [RFC5198]; and (b) SHOULD NOT contain DEL or any C0 or C1 control characters.
( 1.3.18.0.2.24.46.1.101 NAME 'printer-device-id' DESC 'The IEEE 1284 Device ID for this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )
Values of this attribute SHOULD conform to "PWG Command Set Format for IEEE 1284 Device ID v1.0" [PWG5107.2].
Note: For compatibility with [PWG5100.14] and [PWG5107.2], values of this attribute SHOULD NOT exceed 1023 octets in length.
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( 1.3.18.0.2.24.46.1.102 NAME 'printer-device-service-count' DESC 'The number of Printer (print service) instances configured on this Imaging Device (host system).' EQUALITY integerMatch ORDERING integerOrderingMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE )
A positive value indicates the number of Printer (print service) instances. A value of '-1' indicates 'unknown'. A value of '0' is not meaningful (because this attribute must be reported by some Printer instance).
Note: The syntax and values for this attribute are aligned with the equivalent 'device-service-count' attribute defined in [PWG5100.13].
( 1.3.18.0.2.24.46.1.104 NAME 'printer-uuid' DESC 'A URN specifying the UUID of this Printer (print service) instance on this Imaging Device (host system).' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )
For example:
'urn:uuid:f81d4fae-7dec-11d0-a765-00a0c91e6bf6'
Values of this attribute MUST conform to the Universally Unique Identifier (UUID) URN namespace [RFC4122].
Note: For compatibility with [PWG5100.13] and [RFC4122], values of this attribute SHOULD NOT exceed 45 octets in length.
Note: LDAP application clients SHOULD NOT attempt to use malformed URN values read from this attribute. LDAP administrative clients SHOULD NOT write malformed URN values into this attribute.
Note: The syntax and values for this attribute are aligned with the equivalent 'printer-uuid' attribute defined in [PWG5100.13].
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( 1.3.18.0.2.24.46.1.105 NAME 'printer-charge-info' DESC 'Descriptive information about paid printing services for this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )
For example:
'This Printer can be used for paid printing at 2 cents/page.'
Note: For compatibility with [PWG5100.13], values of this attribute SHOULD NOT exceed 1023 octets in length.
Note: For interoperability and consistent text display, values of this attribute (a) SHOULD be normalized as recommended in "Unicode Format for Network Interchange" [RFC5198]; (b) SHOULD NOT contain any C0 or C1 control characters except for HT, CR, and LF; and (c) SHOULD only contain CR and LF characters together (not as singletons).
Note: The syntax and values for this attribute are aligned with the equivalent 'printer-charge-info' attribute defined in [PWG5100.13].
( 1.3.18.0.2.24.46.1.106 NAME 'printer-charge-info-uri' DESC 'A URI for a human-readable Web page for paid printing services for this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )
Note: For compatibility with IPP/1.1 [RFC2911] and [PWG5100.13], values of this attribute SHOULD NOT exceed 1023 octets in length.
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Note: LDAP application clients SHOULD NOT attempt to use malformed URI values read from this attribute. LDAP administrative clients SHOULD NOT write malformed URI values into this attribute.
Note: The syntax and values for this attribute are aligned with the equivalent 'printer-charge-info-uri' attribute defined in [PWG5100.13].
( 1.3.18.0.2.24.46.1.107 NAME 'printer-geo-location' DESC 'A geo: URI specifying the geographic location of this Printer.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 SINGLE-VALUE )
For example:
'geo:13.4125,103.8667'
Values of this attribute MUST conform to the 'geo' URI scheme [RFC5870].
Note: For compatibility with IPP/1.1 [RFC2911] and [PWG5100.13], values of this attribute SHOULD NOT exceed 1023 octets in length.
Note: LDAP application clients SHOULD NOT attempt to use malformed URI values read from this attribute. LDAP administrative clients SHOULD NOT write malformed URI values into this attribute.
Note: The syntax and values for this attribute are aligned with the equivalent 'printer-geo-location' attribute defined in [PWG5100.13].
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( 1.3.18.0.2.24.46.1.108 NAME 'printer-ipp-features-supported' DESC 'Comma-delimited list of IPP protocol features that this Printer supports.' EQUALITY caseIgnoreMatch SUBSTR caseIgnoreSubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 )
Note: Length overflow in values of this attribute MUST be handled by multiple instances of this attribute, i.e., individual comma-delimited list members MUST NOT be truncated.
Values of this attribute SHOULD specify only IANA-registered keywords for the 'ipp-features-supported' attribute defined in [PWG5100.13] or other Standards Track IETF or IEEE-ISTO PWG specifications if this Printer implementation meets all of the IPP feature-specific conformance requirements.
IANA-registered values include:
'none' (No extension features are supported) 'document-object' (Document object defined in [PWG5100.5]) 'job-save' (Job save defined in [PWG5100.11]) 'ipp-everywhere' ("IPP Everywhere" defined in [PWG5100.14]) 'page-overrides' (Page overrides defined in [PWG5100.6]) 'proof-print' (Proof print defined in [PWG5100.11]) 'subscription-object' (Subscription object defined in [RFC3995])
Note: The value 'unknown' MUST only be reported if the corresponding IPP Printer attribute is not present, i.e., the value 'unknown' is an artifact of this LDAP mapping.
Note: The syntax and values for this attribute are aligned with the equivalent 'ipp-features-supported' attribute defined in [PWG5100.13].
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This document does not define any new syntaxes or matching rules.
This document defines a few new attribute types that have been registered by IANA per this document (see Section 7.1 below).
All of the object classes and most of the attribute types described in this document were registered by IANA when RFC 3712 was published (see Section 7.2 below).
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All text string attributes defined in this document of syntax 'DirectoryString' [RFC4517] have values that are encoded in UTF-8 [STD63], as required by [RFC4517].
A language tag [BCP47] for all of the text string attributes defined in this document is contained in the printer-natural-language-configured attribute.
Therefore, all object classes defined in this document conform to the IETF Policy on Character Sets and Languages [BCP18].
Note: For interoperability and consistent text display, values of attributes defined in this document (a) SHOULD be normalized as recommended in "Unicode Format for Network Interchange" [RFC5198]; (b) SHOULD NOT contain DEL or any C0 or C1 control characters except for HT, CR, and LF; (c) SHOULD only contain CR and LF characters together (not as singletons); and (d) SHOULD NOT contain HT, CR, or LF characters in names, e.g., printer-name and printer-aliases.
See [RFC4513] for detailed guidance on authentication methods for LDAP and the use of TLS/1.2 [RFC5246] to supply connection confidentiality and data integrity for LDAP sessions.
As with any LDAP schema, it is important to protect specific entries and attributes with the appropriate access control. It is particularly important that only administrators can modify entries defined in this LDAP Printer schema. Otherwise, an LDAP client might be fooled into diverting print service requests from the original Printer (or spooler) to a malicious intruder's host system, thus exposing the information in printed documents.
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Note: Security vulnerabilities can arise if DEL or any C0 or C1 control characters are included in names, e.g., printer-name or printer-aliases.
For additional security considerations regarding deploying Printers in an IPP environment, see Section 8 of [RFC2911].
[PWG5100.5] Carney, D., Hastings, T., and P. Zehler, "IPP Document Object", PWG 5100.5-2003, October 2003, <http://www.pwg.org/standards.html>.
[PWG5100.6] Zehler, P., Herriot, R., and K. Ocke, "IPP Page Overrides", PWG 5100.6-2003, October 2003, <http://www.pwg.org/standards.html>.
[PWG5100.11] Hastings, T. and D. Fullman, "IPP Job and Printer Extensions - Set 2 (JPS2)", PWG 5100.11-2010, October 2010, <http://www.pwg.org/standards.html>.
[PWG5100.12] Bergman, R., Lewis, H., McDonald, I., and M. Sweet, "IPP Version 2.0 Second Edition (IPP/2.0 SE)", PWG 5100.12-2011, February 2011, <http://www.pwg.org/standards.html>.
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[PWG5100.13] Sweet, M., McDonald, I., and P. Zehler, "IPP Job and Printer Extensions - Set 3 (JPS3)", PWG 5100.13-2012, July 2012, <http://www.pwg.org/standards.html>.
[PWG5100.14] Sweet, M., McDonald, I., Mitchell, A., and J. Hutchings, "IPP Everywhere", PWG 5100.14-2013, January 2013, <http://www.pwg.org/standards.html>.
[PWG5101.1] Sweet, M., Bergman, R., and T. Hastings, "PWG Media Standardized Names 2.0 (MSN2)", PWG 5101.1-2013, March 2013, <http://www.pwg.org/standards.html>.
[PWG5107.2] McDonald, I., "PWG Command Set Format for IEEE 1284 Device ID v1.0", PWG 5107.2-2010, May 2010, <http://www.pwg.org/standards.html>.
[RFC2617] Franks, J., Hallam-Baker, P., Hostetler, J., Lawrence, S., Leach, P., Luotonen, A., and L. Stewart, "HTTP Authentication: Basic and Digest Access Authentication", RFC 2617, DOI 10.17487/RFC2617, June 1999, <http://www.rfc-editor.org/info/rfc2617>.
RFC 7612 LDAP Schema for Printer Services June 2015
[RFC5280] Cooper, D., Santesson, S., Farrell, S., Boeyen, S., Housley, R., and W. Polk, "Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile", RFC 5280, DOI 10.17487/RFC5280, May 2008, <http://www.rfc-editor.org/info/rfc5280>.
1) Added many editorial corrections and clarifications
- corrected typos, missing words, and ambiguous sentences;
- replaced lowercase 'printer' with titlecase 'Printer' for readability and consistency with IETF and IEEE-ISTO PWG IPP standards usage;
- added implementation notes;
- updated and added references.
2) Deleted length restrictions from formal definitions of DirectoryString syntax attributes
- replaced with notes recommending length restrictions for compatibility with existing implementations of [RFC3712] and underlying string length limits in [RFC2707], [RFC2911], [RFC3805], [PWG5107.2], [PWG5100.13], and [PWG5100.14].
3) Added new Printer attributes defined in [PWG5107.2], [PWG5100.13], and [PWG5100.14] (see Section 7.1)
- updated the table of Printer attributes and source documents in Section 4 ("Definition of Attribute Types");
- added support for IEEE-ISTO PWG "IPP Everywhere" [PWG5100.14] project.
4) Added implementation note to Section 4 about string encodings
- added discussion of 'List of xxx' and 'One of xxx' encodings;
- stated that any of these attributes can be represented as multiple instances (i.e., to avoid length overflow).
5) Improved comma-delimited examples of string attributes
- added both single-valued and multi-valued examples.
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6) Clarified use of printer-xri-supported and printer-resolution-supported attributes, and their corresponding field delimiters
- added note in Section 4 ("Definition of Attribute Types") to explain the origin of the different field delimiters;
- added examples to show optional *trailing* whitespace after '<' delimiters in printer-xri-supported;
- added examples to show optional *trailing* whitespace after '>' delimiters in printer-resolution-supported.
RFC 7612 LDAP Schema for Printer Services June 2015
Acknowledgments
The authors wish to acknowledge significant contributions from Ken Jones and Harry Lewis and excellent comments from Patrik Faltstrom, Ryan Moats, Robert Moore, Lee Rafalow, Kimberly Reger, and Kurt Zeilenga during the development of the original LDAP Printer schema [RFC3712].
The authors wish to acknowledge excellent comments from Nevil Brownlee, Barry Leiba, Alexey Melnikov, Tom Petch, and Mike Sweet during the development of this current version of the LDAP Printer schema.
Thanks to the members of the IEEE-ISTO PWG IPP Working Group, for their review comments and help in preparing this document.
Authors' Addresses
Pat Fleming Independent 51796 171 Ave. Pine Island, MN 55963 United States