INTERNET-DRAFT S. Legg draft-legg-xed-schema-05.txt eB2Bcom Intended Category: Experimental D. Prager August 30, 2007 The XML-Enabled Directory: Schema Operational Attributes Copyright (C) The IETF Trust (2007). Status of This Memo By submitting this Internet-draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress". The list of current Internet-Drafts can be accessed at http://www.ietf.org/1id-abstracts.html The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html Technical discussion of this document should take place on the XED developers mailing list . Please send editorial comments directly to the editor . Further information is available on the XED website: www.xmled.info. This Internet-Draft expires on 29 February 2008. Abstract This document defines additional subschema operational attributes for the XML-Enabled Directory (XED) that allow user-defined directory attribute syntaxes to be imported into a directory server. User- defined syntaxes specified in XML Schema, RELAX NG, or Abstract Syntax Notation One (ASN.1), or specified as XML document type Legg & Prager Expires 29 February 2008 [Page 1] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 definition (DTD) element type declarations, are supported. Table of Contents 1. Introduction ....................................................2 2. Conventions .....................................................2 3. Additional System Schema ........................................3 3.1. The Schema Identity Syntax .................................3 3.2. The Identified Schema Syntax ...............................3 3.3. The schemaIdentityMatch Matching Rule ......................5 3.4. The definitions Attribute ..................................5 4. Referencing Imported Schemas ....................................6 5. Example .........................................................7 6. Security Considerations ........................................12 7. Acknowledgements ...............................................12 8. IANA Considerations ............................................12 9. References .....................................................13 9.1. Normative References ......................................13 9.2. Informative References ....................................14 Appendix A. ASN.1 for XED Schema ..................................14 Appendix B. ASN.X for XED Schema ..................................16 1. Introduction This document defines additional subschema operational attributes for the XML-Enabled Directory (XED) [XED] that allow user-defined attribute syntaxes to be imported into a directory server. User- defined syntaxes specified in XML Schema [XSD1], RELAX NG [RNG], or Abstract Syntax Notation One (ASN.1) [X.680] (in the form of Abstract Syntax Notation X [ASN.X]), or specified as XML document type definition (DTD) [XML10] element type declarations, are supported. The Attribute Type Description syntax [SYNTAX] is extended to enable definitions from an imported user-defined schema to be referenced in the definition of the syntax of a directory attribute type. 2. Conventions The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", and "MAY" in this document are to be interpreted as described in BCP 14, RFC 2119 [BCP14]. The key word "OPTIONAL" is exclusively used with its ASN.1 meaning. The term "attribute" shall be taken to mean a directory attribute, not an XML attribute. Throughout this document the term "type" is always qualified as either an attribute type, ASN.1 type, or XML Schema type, as Legg & Prager Expires 29 February 2008 [Page 2] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 appropriate. 3. Additional System Schema An additional subschema operational attribute is defined to hold user supplied schema definitions. This attribute requires the definition of new attribute syntaxes and a new matching rule [MODELS]. The ASN.1 definitions in this section are consolidated in the XED-SchemaOperationalAttributes ASN.1 module in Appendix A. The Abstract Syntax Notation X (ASN.X) translation of this module is presented in Appendix B. 3.1. The Schema Identity Syntax A value of the Schema Identity syntax is a URI [URI] identifying a schema definition document. The LDAP definition for the Schema Identity syntax is: ( 1.3.6.1.4.1.21472.5.5.0 DESC 'Schema Identity' ) The LDAP-specific encoding for a value of the Schema Identity syntax is the URI character string. The ASN.1 type corresponding to the Schema Identity syntax is defined as follows: SchemaIdentity ::= AnyURI The AnyURI ASN.1 type is defined by the specification for the Robust XML Encoding Rules (RXER) [RXER]. 3.2. The Identified Schema Syntax A value of the Identified Schema syntax is a URI identifying a schema definition along with the schema definition document itself; either an ASN.X module, an XML Schema document, a RELAX NG grammar, or an external DTD subset [XML10]. The LDAP definition for the Identified Schema syntax is: ( 1.3.6.1.4.1.21472.5.5.1 DESC 'Identified Schema' ) The ASN.1 type corresponding to the Identified Schema syntax is defined as follows, assuming AUTOMATIC TAGS: IdentifiedSchema ::= SEQUENCE { Legg & Prager Expires 29 February 2008 [Page 3] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 identifier SchemaIdentity, description DirectoryString { ub-schema } OPTIONAL, obsolete BOOLEAN DEFAULT FALSE, document SchemaDocument } SchemaDocument ::= CHOICE { module [RXER:ELEMENT-REF { namespace-name "urn:ietf:params:xml:ns:asnx", local-name "module" }] Markup, schema [RXER:ELEMENT-REF { namespace-name "http://www.w3.org/2001/XMLSchema", local-name "schema" }] Markup, grammar [RXER:ELEMENT-REF { namespace-name "http://relaxng.org/ns/structure/1.0", local-name "grammar" }] Markup, dtd ExternalSubset } ExternalSubset ::= UTF8String (CONSTRAINED BY { -- contains an external DTD subset, -- i.e., text conforming to -- the extSubset production of XML -- }) The LDAP-specific encoding of a value of the Identified Schema syntax is defined to be the same as the encoding of the value according to the "transfer-rxer" transfer encoding option [TRANSFER]. Aside: This does not impose a requirement to explicitly use the "transfer-rxer" option when requesting and transferring attributes of the Identified Schema syntax. The dtd alternative of the document component of a value of the Identified Schema syntax is constrained to contain an external DTD subset, i.e., text conforming to the extSubset production of XML [XML10]. When the dtd alternative of the document component is selected, the identifier component of the value SHOULD contain the system identifier [XML10] of the external DTD subset. Note that an internal DTD subset, i.e., text conforming to the intSubset production of XML, is also of the correct syntactic form for an external DTD subset. Where a DTD comprises both an external subset and an internal subset, it is necessary to append the external subset to the internal subset for storage in the dtd alternative of the document component. If the DTD subset references an external parameter entity that conforms to the extSubset production, then that entity MAY be stored as a separate value of the Identified Schema syntax, in which case the identifier component of this separate value Legg & Prager Expires 29 February 2008 [Page 4] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 SHOULD be the system identifier [XML10] of the external parameter entity. Otherwise, an external parameter entity MUST be replaced in the DTD subset by its replacement text or included in the DTD subset as an equivalent internal parameter entity. Where an external parameter entity is stored as a separate value of the Identified Schema syntax, the identifier component of that value MUST be the same as the system identifier in the corresponding external entity declaration in the DTD subset. Note that in the RXER encoding [RXER] of a value of the Identified Schema syntax, markup in the dtd alternative must be escaped. This is most easily achieved by encoding the string value of the dtd alternative within a CDATA section [XML10][XML11]. 3.3. The schemaIdentityMatch Matching Rule The schemaIdentityMatch matching rule compares an assertion value of the Schema Identity syntax to an attribute value of a syntax (e.g the Identified Schema syntax) whose corresponding ASN.1 type is a SEQUENCE with a mandatory first component of the SchemaIdentity ASN.1 type. Note that the assertion syntax of this matching rule differs from the attribute syntax of attributes for which this is the equality matching rule. The rule evaluates to TRUE if and only if the assertion value and the first component of the attribute value have the same number of characters, and corresponding characters have the same code point. The LDAP-style definition for the schemaIdentityMatch matching rule is: ( 1.3.6.1.4.1.21472.5.13.0 NAME 'schemaIdentityMatch' SYNTAX 1.3.6.1.4.1.21472.5.5.0 ) The X.500-style definition for the schemaIdentityMatch matching rule is: schemaIdentityMatch MATCHING-RULE ::= { SYNTAX SchemaIdentity ID { iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) xmled(21472) ds(5) matchingRule(13) 0 } } 3.4. The definitions Attribute Legg & Prager Expires 29 February 2008 [Page 5] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 User-defined schema documents are imported into a XED server as values of the definitions attribute in a subschema subentry [MODELS]. A particular schema document potentially appears in more than one subschema subentry, in which case the same identifier MUST be used for the schema document throughout the Directory Information Tree (DIT) [MODELS]. The LDAP-style definition for the definitions attribute is: ( 1.3.6.1.4.1.21472.5.21.0 NAME 'definitions' EQUALITY schemaIdentityMatch SYNTAX 1.3.6.1.4.1.21472.5.5.1 USAGE directoryOperation ) The X.500-style definition for the definitions attribute is: definitions ATTRIBUTE ::= { WITH SYNTAX IdentifiedSchema EQUALITY MATCHING RULE schemaIdentityMatch USAGE directoryOperation ID { iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) xmled(21472) ds(5) schemaOperationalAttribute(21) 0 } } 4. Referencing Imported Schemas Since the second edition of X.500, users have theoretically been able to import their own attribute syntax definitions into subschema in the form of ASN.1 type definitions. The attributeSyntax component of the AttributeTypeDescription ASN.1 type [X.501] (the associated ASN.1 type for the Attribute Type Description syntax [SYNTAX]) is a character string permitted to contain the text of an ASN.1 type definition. However, the LDAP-specific encoding of the AttributeTypeDescription ASN.1 type replaces the character string with an OBJECT IDENTIFIER [X.680], effectively allowing only predefined syntaxes in LDAP. This specification defines an extension field for the LDAP-specific encoding of the Attribute Type Description syntax so that the character string content of the attributeSyntax component can be rendered. In addition, the syntax is permitted to be described using ASN.X, which is more easily parsed than ASN.1 type notation. Encoding instructions [X.680-1] for RXER [RXEREI] enable XML Schema, RELAX NG, and DTD definitions to be simply referenced from an ASN.1 or ASN.X type definition, thus providing the means to define an attribute syntax in terms of these other languages. The identifier of the extension field is X-SYNTAX-DEFINITION. The Legg & Prager Expires 29 February 2008 [Page 6] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 [MODELS] for the extension field SHALL be a single . The content corresponding to the is the character string content of the attributeSyntax component of an instance of the AttributeTypeDescription ASN.1 type. The attributeSyntax component is permitted to contain any character string which is a valid ASN.X type definition (i.e., an ASN.X element), in addition to the content already prescribed by X.501 [X.501]. When the attributeSyntax component contains an ASN.X type definition, the TagDefault [X.680] is assumed to be AUTOMATIC TAGS, and the ExtensionDefault [X.680] is assumed to be empty. If an attribute type is a subtype, and an attribute syntax is specified, then that syntax MUST be compatible with the syntax of the supertype, i.e., every possible abstract value of the subtype's syntax must be an abstract value of the supertype's syntax. Aside: In the case where the syntax of the supertype is a reference to an XML Schema type, then this requirement is satisfied if the syntax of the subtype is the same XML Schema type, or a type derived from it by restriction. An attribute syntax defined through an X-SYNTAX-DEFINITION field is not required to have an associated syntax object identifier [SYNTAX] (thus an attribute definition with an X-SYNTAX-DEFINITION field is not required to also have a SYNTAX field). If an object identifier has not been defined for a syntax, then the X-SYNTAX-DEFINITION field MUST appear, otherwise it MAY appear. If the X-SYNTAX-DEFINITION contains an ASN.X element, and the SYNTAX field is absent, then the LDAP-specific encoding for values of the attribute is assumed to be the same as the "transfer-rxer" encoding [TRANSFER]. 5. Example Suppose a directory administrator wishes to define two new attributes to hold data conforming to the VertexID data type and the element definition from the following XML Schema: Legg & Prager Expires 29 February 2008 [Page 7] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 Assume that this schema document can be uniquely identified by the URI "http://www.example.com/digraph.xsd". The first step is to install the schema definitions into the subschema subentry. Using LDAP, this is done by adding the following value to the definitions attribute in the subschema subentry: http://www.example.com/digraph.xsd Legg & Prager Expires 29 February 2008 [Page 8] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 Note that the LDAP-specific encoding for values of the definitions attribute is exactly the same as the "transfer-rxer" encoding. The value could also be added using XLDAP [XLDAP], using exactly the same markup for the elements. An attribute with the VertexID data type as its syntax is defined for LDAP like so: ( 1.3.6.1.4.1.21472.5.4.0.0 NAME 'startVertex' X-SYNTAX-DEFINITION ' ') which (minus the first line break) is also the LDAP-specific encoding of the value of the Attribute Type Description syntax that must be added to the attributeTypes attribute in the subschema subentry to publish the definition of the startVertex attribute. The "transfer-rxer" encoding for the definition of the startVertex attribute is: 1.3.6.1.4.1.21472.5.4.0.0 startVertex ]]> The attributeSyntax component is a DirectoryString [X.501], hence markup embedded in it must be escaped (in this case using a CDATA Legg & Prager Expires 29 February 2008 [Page 9] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 section). The definition of the startVertex attribute could also be added to a subschema subentry using XLDAP, using exactly the same markup for the element. A single-valued attribute where the value contains a element can be defined for LDAP like so: ( 1.3.6.1.4.1.21472.5.4.0.1 NAME 'transportNetwork' SINGLE-VALUE X-SYNTAX-DEFINITION ' ' ) The "transfer-rxer" encoding for the definition of the transportNetwork attribute is: 1.3.6.1.4.1.21472.5.4.0.1 transportNetwork ]]> false The format for the contents of the attributeSyntax component has been chosen for consistency with the ASN.X representation of attribute type definitions in X.500. Consider the X.500-style definitions for the startVertex and transportNetwork attributes. startVertex ATTRIBUTE ::= { WITH SYNTAX [RXER:TYPE-REF { namespace-name "http://www.example.com/directed-graph", local-name "VertexID" }] Markup Legg & Prager Expires 29 February 2008 [Page 10] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 ID { iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) xmled(21472) ds(5) attributeType(4) example(0) 0 } } transportNetwork ATTRIBUTE ::= { WITH SYNTAX CHOICE { graph [RXER:ELEMENT-REF { namespace-name "http://www.example.com/directed-graph", local-name "graph" }] Markup } SINGLE-VALUE TRUE ID { iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) xmled(21472) ds(5) attributeType(4) example(0) 1 } } An ASN.X representation for these two ATTRIBUTE information objects is (where the namespace prefix "inf:" stands for the namespace name "http://xmled.info/ns/X.500/5/InformationFramework"): Note the correspondence between the content of the "Type" fields in the ASN.X representation of the information objects, the X-SYNTAX-DEFINITION fields in the LDAP attribute definitions, and the Legg & Prager Expires 29 February 2008 [Page 11] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 components in the "transfer-rxer" encodings of AttributeTypeDescription. 6. Security Considerations Attributes of directory entries are used to provide descriptive information about the real-world objects they represent, which can be people, organizations, and devices, among other things. Most countries have privacy laws regarding the publication of information about people. 7. Acknowledgements The technology described in this document is the product of a research project begun jointly by Adacel Technologies Limited and Deakin University, and subsequently refined and completed by eB2Bcom. 8. IANA Considerations The Internet Assigned Numbers Authority (IANA) is requested to update the LDAP descriptors registry [BCP64] as indicated by the following templates: Subject: Request for LDAP Descriptor Registration Descriptor (short name): schemaIdentityMatch Object Identifier: 1.3.6.1.4.1.21472.5.13.0 Person & email address to contact for further information: Steven Legg Usage: other (matching rule) Specification: RFC XXXX Author/Change Controller: IESG Subject: Request for LDAP Descriptor Registration Descriptor (short name): definitions Object Identifier: 1.3.6.1.4.1.21472.5.21.0 Person & email address to contact for further information: Steven Legg Usage: attribute type Specification: RFC XXXX Author/Change Controller: IESG The IANA is requested to register a new XML namespace in accordance with RFC 3688 [XMLREG]. URI: urn:ietf:params:xml:ns:xed-soa Registrant Contact: Steven Legg Legg & Prager Expires 29 February 2008 [Page 12] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 XML: None The object identifiers have been assigned for use in this specification by xmled.org, under an arc assigned to xmled.org by the IANA. 9. References 9.1. Normative References [BCP14] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [XMLREG] Mealling, M., "The IETF XML Registry", RFC 3688, January 2004. [URI] Berners-Lee, T., Fielding, R. and L. Masinter, "Uniform Resource Identifiers (URI): Generic Syntax", STD 66, RFC 3986, January 2005. [ABNF] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax Specifications: ABNF", RFC 4234, October 2005. [MODELS] Zeilenga, K., "Lightweight Directory Access Protocol (LDAP): Directory Information Models", RFC 4512, June 2006. [SYNTAX] Legg, S., Ed., "Lightweight Directory Access Protocol (LDAP): Syntaxes and Matching Rules", RFC 4517, June 2006. [BCP64] Zeilenga, K., "Internet Assigned Numbers Authority (IANA) Considerations for the Lightweight Directory Access Protocol (LDAP)", BCP 64, RFC 4520, June 2006. [RXER] Legg, S. and D. Prager, "Robust XML Encoding Rules (RXER) for Abstract Syntax Notation One (ASN.1)", RFC 4910, July 2007. [RXEREI] Legg, S., "Encoding Instructions for the Robust XML Encoding Rules (RXER)", RFC 4911, July 2007. [ASN.X] Legg, S., "Abstract Syntax Notation X (ASN.X)", RFC 4912, July 2007. [TRANSFER] Legg, S., "Lightweight Directory Access Protocol (LDAP): Transfer Encoding Options", draft-legg-ldap-transfer-xx.txt, a work in progress, August 2006. Legg & Prager Expires 29 February 2008 [Page 13] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 [X.501] ITU-T Recommendation X.501 (08/05) | ISO/IEC 9594-2:2005, Information technology - Open Systems Interconnection - The Directory: Models. [X.680] ITU-T Recommendation X.680 (07/02) | ISO/IEC 8824-1, Information technology - Abstract Syntax Notation One (ASN.1): Specification of basic notation. [X.680-1] ITU-T Recommendation X.680 (2002) Amendment 1 (10/03) | ISO/IEC 8824-1:2002/Amd 1:2004, Support for EXTENDED-XER. [XML10] Bray, T., Paoli, J., Sperberg-McQueen, C., Maler, E. and F. Yergeau, "Extensible Markup Language (XML) 1.0 (Fourth Edition)", W3C Recommendation, http://www.w3.org/TR/2006/REC-xml-20060816, August 2006. [XML11] Bray, T., Paoli, J., Sperberg-McQueen, C., Maler, E., Yergeau, F., and J. Cowan, "Extensible Markup Language (XML) 1.1 (Second Edition)", W3C Recommendation, http://www.w3.org/TR/2006/REC-xml11-20060816, August 2006. [XSD1] Thompson, H., Beech, D., Maloney, M. and N. Mendelsohn, "XML Schema Part 1: Structures Second Edition", W3C Recommendation, http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/, October 2004. [RNG] Clark, J. and M. Makoto, "RELAX NG Tutorial", OASIS Committee Specification, http://www.oasis- open.org/committees/relax-ng/tutorial-20011203.html, December 2001. 9.2. Informative References [XED] Legg, S. and D. Prager, "The XML-Enabled Directory", draft-legg-xed-roadmap-xx.txt, a work in progress, August 2007. [XLDAP] Legg, S. and D. Prager, "The XML-Enabled Directory: Protocols", draft-legg-xed-protocols-xx.txt, a work in progress, August 2007. Appendix A. ASN.1 for XED Schema This appendix is normative. XED-SchemaOperationalAttributes { iso(1) identified-organization(3) dod(6) Legg & Prager Expires 29 February 2008 [Page 14] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 internet(1) private(4) enterprise(1) xmled(21472) ds(5) module(1) schema(0) } -- Copyright (C) The IETF Trust (2007). This version of -- this ASN.1 module is part of RFC XXXX; see the RFC itself -- for full legal notices. -- -- Regarding this ASN.1 module or any portion of it, the authors -- make no guarantees and are not responsible for any damage -- resulting from its use. The authors grant irrevocable permission -- to anyone to use, modify, and distribute it in any way that does -- not diminish the rights of anyone else to use, modify, and -- distribute it, provided that redistributed derivative works do -- not contain misleading author or version information. -- Derivative works need not be licensed under similar terms. DEFINITIONS RXER INSTRUCTIONS AUTOMATIC TAGS EXTENSIBILITY IMPLIED ::= BEGIN IMPORTS Markup, AnyURI FROM AdditionalBasicDefinitions { iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) xmled(21472) asnx(1) module(0) basic(0) } ATTRIBUTE, MATCHING-RULE FROM InformationFramework { joint-iso-itu-t ds(5) module(1) informationFramework(1) 5 } DirectoryString{} FROM SelectedAttributeTypes { joint-iso-itu-t ds(5) module(1) selectedAttributeTypes(5) 5 } ub-schema FROM UpperBounds { joint-iso-itu-t ds(5) module(1) upperBounds(10) 5 } ; SchemaIdentity ::= AnyURI IdentifiedSchema ::= SEQUENCE { identifier SchemaIdentity, description DirectoryString { ub-schema } OPTIONAL, Legg & Prager Expires 29 February 2008 [Page 15] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 obsolete BOOLEAN DEFAULT FALSE, document SchemaDocument } SchemaDocument ::= CHOICE { module [RXER:ELEMENT-REF { namespace-name "urn:ietf:params:xml:ns:asnx", local-name "module" }] Markup, schema [RXER:ELEMENT-REF { namespace-name "http://www.w3.org/2001/XMLSchema", local-name "schema" }] Markup, grammar [RXER:ELEMENT-REF { namespace-name "http://relaxng.org/ns/structure/1.0", local-name "grammar" }] Markup, dtd ExternalSubset } ExternalSubset ::= UTF8String (CONSTRAINED BY { -- contains an external DTD subset, -- i.e., text conforming to -- the extSubset production of XML -- }) schemaIdentityMatch MATCHING-RULE ::= { SYNTAX SchemaIdentity ID { iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) xmled(21472) ds(5) matchingRule(13) 0 } } definitions ATTRIBUTE ::= { WITH SYNTAX IdentifiedSchema EQUALITY MATCHING RULE schemaIdentityMatch USAGE directoryOperation ID { iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) xmled(21472) ds(5) schemaOperationalAttribute(21) 0 } } ENCODING-CONTROL RXER SCHEMA-IDENTITY "urn:oid:1.3.6.1.4.1.21472.5.1.0" TARGET-NAMESPACE "urn:ietf:params:xml:ns:xed-soa" PREFIX "soa" END Appendix B. ASN.X for XED Schema This appendix is non-normative. This appendix contains the ASN.X [ASN.X] translation of the Legg & Prager Expires 29 February 2008 [Page 16] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 XED-SchemaOperationalAttributes module. Target namespaces are assigned to the X.500 modules by the XED protocols specification [XLDAP] to faciliate references to them from an ASN.X module. Copyright (C) The IETF Trust (2007). This version of this ASN.X module is part of RFC XXXX; see the RFC itself for full legal notices. Regarding this ASN.X module or any portion of it, the authors make no guarantees and are not responsible for any damage resulting from its use. The authors grant irrevocable permission to anyone to use, modify, and distribute it in any way that does not diminish the rights of anyone else to use, modify, and distribute it, provided that redistributed derivative works do not contain misleading author or version information. Derivative works need not be licensed under similar terms. Legg & Prager Expires 29 February 2008 [Page 17] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 Legg & Prager Expires 29 February 2008 [Page 18] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 Legg & Prager Expires 29 February 2008 [Page 19] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 contains an external DTD subset, i.e., text conforming to the extSubset production of XML Authors' Addresses Dr. Steven Legg eB2Bcom Suite 1, 85-87 Charles Street Kew, Victoria 3103 AUSTRALIA Phone: +61 3 9851 8630 Fax: +61 3 9851 8601 EMail: steven.legg@eb2bcom.com Legg & Prager Expires 29 February 2008 [Page 20] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 Dr. Daniel Prager EMail: dap@austhink.com Full Copyright Statement Copyright (C) The IETF Trust (2007). 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The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Note to the RFC Editor: the remainder of this document is to be removed before final publication. Changes in Draft 01 Legg & Prager Expires 29 February 2008 [Page 21] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 An LDAP-specific encoding for the Identified DTD syntax has been nominated. The Directory XML Encoding Rules (DXER) have been renamed to the Robust XML Encoding Rules (RXER). Changes in Draft 02 The content of the definitions component of the IdentifiedDTD ASN.1 type has been changed from an XML prolog to an XML external DTD subset. An external DTD subset is more general than the internal DTD subset in an XML prolog, and is also more likely to be the form of a DTD from which directory attribute syntaxes might be defined. In examples, the root element in "transfer-rxer" encoded LDAP attribute values has been changed from to in line with the NamedType definitions in the latest draft for the LDAP protocol (draft-ietf-ldapbis-protocol-24.txt). Changes in Draft 03 The declarations and doctypedecls attributes have been replaced by the definitions attribute. The Identified DTD syntax has been removed. The Identified Schema syntax has been revised and now covers DTDs. The OBJECT IDENTIFIERs assigned throughout this document have been replaced. ASN.1 Schema has been renamed to Abstract Syntax Notation X (ASN.X) and the element has been renamed to . Changes in Draft 04 The AnyType ASN.1 type has been renamed to Markup. A description field and an obsolete field have been added to the IdentifiedSchema type. Changes in Draft 05 This specification has been downgraded from an intended category of Proposed Standard to Experimental because the RXER and ASN.X specifications on which it depends are in the Experimental category. The SYNTAX-DEFINITION field has been changed to the X-SYNTAX-DEFINITION field because this specification will now be Legg & Prager Expires 29 February 2008 [Page 22] INTERNET-DRAFT XED: Schema Operational Attributes August 30, 2007 classed as experimental. A shorter, self-contained example has replaced the previous example in Section 5. Legg & Prager Expires 29 February 2008 [Page 23]