One document matched: draft-legg-xed-schema-03.txt
Differences from draft-legg-xed-schema-02.txt
INTERNET-DRAFT S. Legg
draft-legg-xed-schema-03.txt eB2Bcom
Intended Category: Standards Track D. Prager
Updates: [MODELS] November 29, 2005
The XML Enabled Directory: Schema Operational Attributes
Copyright (C) The Internet Society (2005).
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.
By submitting this Internet-draft, I accept the provisions of
Section 3 of BCP 78.
Internet-Drafts are working documents of the Internet Engineering
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other groups may also distribute working documents as
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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 <xeddev@eb2bcom.com>. Please send editorial
comments directly to the editor <steven.legg@eb2bcom.com>. Further
information is available on the XED website: www.xmled.info.
This Internet-Draft expires on 29 May 2006.
Abstract
This document defines additional subschema operational attributes for
the XML Enabled Directory (XED) that allow user-defined directory
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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 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. . . . . . . . . . . . . . . . 6
4. Referencing Imported Schemas . . . . . . . . . . . . . . . . . 6
5. Example. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6. Security Considerations. . . . . . . . . . . . . . . . . . . . 11
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 11
8. IANA Considerations. . . . . . . . . . . . . . . . . . . . . . 12
Appendix A. ASN.1 for XED Schema . . . . . . . . . . . . . . . . . 12
Appendix B. ASN.X for XED Schema . . . . . . . . . . . . . . . . . 14
Appendix C. XML Schema for XED Schema. . . . . . . . . . . . . . . 16
Normative References . . . . . . . . . . . . . . . . . . . . . . . 17
Informative References . . . . . . . . . . . . . . . . . . . . . . 18
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 19
Full Copyright Statement . . . . . . . . . . . . . . . . . . . . . 19
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) [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", "MAY" and "OPTIONAL" in this
document are to be interpreted as described in BCP 14, RFC 2119
[BCP14].
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This specification makes use of definitions from the XML Information
Set (Infoset) [ISET]. In particular, information item property names
are presented per the Infoset, e.g., [local name]. In the sections
that follow, the term "element" shall be taken to mean an Infoset
element information item.
The term "attribute" shall be taken to mean a directory attribute,
not an Infoset attribute information item.
Throughout this document the term "type" is always qualified as
either an attribute type, ASN.1 type, or XML Schema type, as
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 ASN.X
translation of this module is presented in Appendix B, and the
XML Schema translation [CXSD] of the module is presented in
Appendix C.
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
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definition along with the schema definition document itself; either
an ASN.X document, 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 {
identifier SchemaIdentity,
document SchemaDocument }
SchemaDocument ::= CHOICE {
module [RXER:ELEMENT-REF {
namespace-name "http://xmled.info/ns/ASN.1",
local-name "module" }] AnyType,
schema [RXER:ELEMENT-REF {
namespace-name
"http://www.w3.org/2001/XMLSchema",
local-name "schema" }] AnyType,
grammar [RXER:ELEMENT-REF {
namespace-name
"http://relaxng.org/ns/structure/1.0",
local-name "grammar" }] AnyType,
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 actually 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.
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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
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:
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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
User defined schema documents are imported into a XED server as
values of the definitions attribute in the 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 extends the LDAP-specific encoding of the
Attribute Type Description syntax to include a field to render the
character string content of the attributeSyntax component, and
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additionally permits the syntax 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 type definition,
thus providing the means to define an attribute syntax in terms of
these other languages.
The <AttributeTypeDescription> [MODELS] Augmented Backus-Naur Form
(ABNF) [ABNF] rule is extended by the inclusion of the following ABNF
placed immediately following the ABNF for the optional SYNTAX field:
[ SP "SYNTAX-DEFINITION" SP qdstring ]
The content corresponding to the <qdstring> rule 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 <type>
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 a SYNTAX-DEFINITION field is not
required to have an associated syntax object identifier [SYNTAX]
(thus an attribute definition with a SYNTAX-DEFINITION field is not
required to also have a SYNTAX field).
If the SYNTAX-DEFINITION string contains an ASN.X <type> 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 Address datatype from the Addresses
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for International Purchase Order schema (address.xsd) [XSD0] and the
<purchaseOrder> element from the International Purchase Order Schema
(ipo.xsd) [XSD0].
The first step is to install the schema definitions into the
subschema subentry. Using LDAP, this is done by adding the two
following (much abbreviated) values to the definitions attribute in
the subschema subentry:
<?xml version="1.0"?>
<value>
<identifier>http://www.example.com/schemas/ipo.xsd</identifier>
<document>
<schema targetNamespace="http://www.example.com/IPO"
xmlns="http://www.w3.org/2001/XMLSchema"
xmlns:ipo="http://www.example.com/IPO">
<annotation>
<documentation xml:lang="en">
International Purchase order schema for Example.com
Copyright 2000 Example.com. All rights reserved.
</documentation>
</annotation>
etc.
</schema>
</document>
</value>
<?xml version="1.0"?>
<value>
<identifier>http://www.example.com/schemas/address.xsd</identifier>
<document>
<schema targetNamespace="http://www.example.com/IPO"
xmlns="http://www.w3.org/2001/XMLSchema"
xmlns:ipo="http://www.example.com/IPO">
<annotation>
<documentation xml:lang="en">
Addresses for International Purchase order schema
Copyright 2000 Example.com. All rights reserved.
</documentation>
</annotation>
etc.
</schema>
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</document>
</value>
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 <value> elements.
An attribute with the Address datatype as its syntax is defined for
LDAP like so:
( 1.3.6.1.4.1.21472.5.4.0.0 NAME 'ipo-address'
SYNTAX-DEFINITION '
<type xmlns:ipo="http://www.example.com/IPO"
ref="ipo:Address"/>')
which 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 ipo-address attribute.
The "transfer-rxer" encoding for the definition of the ipo-address
attribute is:
<?xml version="1.0"?>
<value>
<identifier>1.3.6.1.4.1.21472.5.4.0.0</identifier>
<name>
<item>ipo-address</item>
</name>
<information>
<attributeSyntax><![CDATA[
<type xmlns:ipo="http://www.example.com/IPO"
ref="ipo:Address"/>]]></attributeSyntax>
</information>
</value>
The attributeSyntax component is a DirectoryString [X.501] hence
markup embedded in it must be escaped (in this case using a CDATA
section).
The definition of the ipo-address attribute could also be added to a
subschema subentry using XLDAP, using exactly the same markup for the
<value> element.
An attribute whose values each contain a single <purchaseOrder>
element can be defined for LDAP like so:
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( 1.3.6.1.4.1.21472.5.4.0.1 NAME 'purchaseOrder'
SYNTAX-DEFINITION '
<type xmlns:ipo="http://www.example.com/IPO">
<choice>
<element ref="ipo:purchaseOrder/>
</choice>
</type>' )
The "transfer-rxer" encoding for the definition of the purchaseOrder
attribute is:
<?xml version="1.0"?>
<value>
<identifier>1.3.6.1.4.1.21472.5.4.0.1</identifier>
<name>
<item>purchaseOrder</item>
</name>
<information>
<attributeSyntax><![CDATA[
<type xmlns:ipo="http://www.example.com/IPO">
<choice>
<element ref="ipo:purchaseOrder/>
</choice>
</type>]]></attributeSyntax>
</information>
</value>
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 ipo-address and purchaseOrder attributes.
ipo-address ATTRIBUTE ::= {
WITH SYNTAX [RXER:TYPE-REF {
namespace-name "http://www.example.com/IPO",
local-name "Address" }]
AnyType
ID { iso(1) identified-organization(3) dod(6)
internet(1) private(4) enterprise(1)
xmled(21472) ds(5) attributeType(4) example(0) 0 } }
purchaseOrder ATTRIBUTE ::= {
WITH SYNTAX
CHOICE {
purchaseOrder
[RXER:ELEMENT-REF {
namespace-name "http://www.example.com/IPO",
local-name "purchaseOrder" }]
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AnyType
}
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.500/4/InformationFramework"):
<namedObject name="ipo-address" class="inf:ATTRIBUTE">
<object>
<field name="Type">
<type xmlns:ipo="http://www.example.com/IPO"
ref="ipo:Address"/>
</field>
<field name="id" literalValue="1.3.6.1.4.1.21472.5.4.0.0"/>
</object>
</namedObject>
<namedObject name="purchaseOrder" class="inf:ATTRIBUTE">
<object>
<field name="Type">
<type xmlns:ipo="http://www.example.com/IPO">
<choice>
<element ref="ipo:purchaseOrder/>
</choice>
</type>
</field>
<field name="id" literalValue="1.3.6.1.4.1.21472.5.4.0.1"/>
</object>
</namedObject>
Note the correspondence between the content of the "Type" fields in
the ASN.X representation of the information objects, the
SYNTAX-DEFINITION fields in the LDAP attribute definitions, and the
<attributeSyntax> 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
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This document and the technology it describes are a product of a
joint research project between Adacel Technologies Limited and Deakin
University on leveraging existing directory technology to produce an
XML-based directory service.
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 <steven.legg@eb2bcom.com>
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 <steven.legg@eb2bcom.com>
Usage: attribute type
Specification: RFC XXXX
Author/Change Controller: IESG
The object identifiers have been assigned for use in this
specification by xmled.org, under an arc assigned to xmled.org by
IANA.
Appendix A. ASN.1 for XED Schema
This appendix is normative.
XED-SchemaOperationalAttributes
{ iso(1) identified-organization(3) dod(6)
internet(1) private(4) enterprise(1)
xmled(21472) ds(5) module(1) schema(0) }
-- Copyright (C) The Internet Society (2005). This version of
-- this ASN.1 module is part of RFC XXXX; see the RFC itself
-- for full legal notices.
DEFINITIONS
RXER INSTRUCTIONS
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AUTOMATIC TAGS
EXTENSIBILITY IMPLIED ::= BEGIN
IMPORTS
ATTRIBUTE,
MATCHING-RULE
FROM InformationFramework
{ joint-iso-itu-t ds(5) module(1)
informationFramework(1) 4 }
AnyType,
AnyURI
FROM AdditionalBasicDefinitions
{ iso(1) identified-organization(3) dod(6)
internet(1) private(4) enterprise(1)
xmled(21472) asn1(1) module(0) basic(0) }
;
SchemaIdentity ::= AnyURI
IdentifiedSchema ::= SEQUENCE {
identifier SchemaIdentity,
document SchemaDocument }
SchemaDocument ::= CHOICE {
module [RXER:ELEMENT-REF {
namespace-name "http://xmled.info/ns/ASN.1",
local-name "module" }] AnyType,
schema [RXER:ELEMENT-REF {
namespace-name
"http://www.w3.org/2001/XMLSchema",
local-name "schema" }] AnyType,
grammar [RXER:ELEMENT-REF {
namespace-name
"http://relaxng.org/ns/structure/1.0",
local-name "grammar" }] AnyType,
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 } }
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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
"http://xmled.info/id/XED/1/SchemaOperationalAttributes"
TARGET-NAMESPACE
"http://xmled.info/ns/XED/1/SchemaOperationalAttributes"
END
Appendix B. ASN.X for XED Schema
This appendix is non-normative.
<?xml version="1.0"?>
<asn1:module
xmlns:asn1="http://xmled.info/ns/ASN.1"
xmlns:if="http://xmled.info/ns/X.500/4/InformationFramework"
name="XED-SchemaOperationalAttributes"
identifier="1.3.6.1.4.1.21472.5.1.0"
schemaIdentity=
"http://xmled.info/id/XED/1/SchemaOperationalAttributes"
xmlns:soa=
"http://xmled.info/ns/XED/1/SchemaOperationalAttributes"
targetNamespace=
"http://xmled.info/ns/XED/1/SchemaOperationalAttributes"
extensibilityImplied="true">
<annotation>
Copyright (C) The Internet Society 2005. This version of
this ASN.X module is part of RFC XXXX; see the RFC itself
for full legal notices.
</annotation>
<import
name="InformationFramework"
identifier="2.5.1.1.4"
schemaIdentity=
"http://xmled.info/id/X.500/4/InformationFramework"
namespace="http://xmled.info/ns/X.500/4/InformationFramework"/>
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<namedType name="SchemaIdentity" type="asn1:AnyURI"/>
<namedType name="IdentifiedSchema">
<type>
<sequence>
<element name="identifier" type="soa:SchemaIdentity"/>
<element name="document" type="soa:SchemaDocument"/>
</sequence>
</type>
</namedType>
<namedType name="SchemaDocument">
<type>
<choice>
<element ref="asn1:module"/>
<element xmlns:xsd="http://www.w3.org/2001/XMLSchema"
ref="xsd:schema"/>
<element xmlns:rng="http://relaxng.org/ns/structure/1.0"
ref="rng:grammar"/>
<element name="dtd" type="soa:ExternalSubset"/>
</choice>
</type>
</namedType>
<namedType name="ExternalSubset">
<type>
<constrained type="asn1:UTF8String">
<constrainedBy/>
</constrained>
</type>
</namedType>
<namedObject name="schemaIdentityMatch" class="if:MATCHING-RULE">
<object>
<field name="AssertionType" type="soa:SchemaIdentity"/>
<field name="id" literalValue="1.3.6.1.4.1.21472.5.13.0"/>
</object>
</namedObject>
<namedObject name="definitions" class="if:ATTRIBUTE">
<object>
<field name="Type" type="soa:IdentifiedSchema"/>
<field name="equality-match" object="soa:schemaIdentityMatch"/>
<field name="usage" literalValue="directoryOperation"/>
<field name="id" literalValue="1.3.6.1.4.1.21472.5.21.0"/>
</object>
</namedObject>
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</asn1:module>
Appendix C. XML Schema for XED Schema
This appendix is non-normative.
<?xml version="1.0"?>
<xsd:schema
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:asn1="http://xmled.info/ns/ASN.1"
xmlns:soa=
"http://xmled.info/ns/XED/1/SchemaOperationalAttributes"
targetNamespace=
"http://xmled.info/ns/XED/1/SchemaOperationalAttributes"
blockDefault="#all">
<xsd:annotation>
<xsd:documentation>
Copyright (C) The Internet Society (2005). This version of
this XML Schema is part of RFC XXXX; see the RFC itself
for full legal notices.
</xsd:documentation>
</xsd:annotation>
<xsd:import namespace="http://xmled.info/ns/ASN.1"/>
<xsd:import namespace="http://www.w3.org/2001/XMLSchema"/>
<xsd:import namespace="http://relaxng.org/ns/structure/1.0"/>
<xsd:simpleType name="SchemaIdentity">
<xsd:restriction base="asn1:AnyURI"/>
</xsd:simpleType>
<xsd:complexType name="IdentifiedSchema">
<xsd:sequence>
<xsd:element name="identifier" type="soa:SchemaIdentity"/>
<xsd:element name="document" type="soa:SchemaDocument"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="SchemaDocument">
<xsd:choice>
<xsd:element ref="asn1:module"/>
<xsd:element xmlns:xsd="http://www.w3.org/2001/XMLSchema"
ref="xsd:schema"/>
<xsd:element xmlns:rng="http://relaxng.org/ns/structure/1.0"
ref="rng:grammar"/>
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<xsd:element name="dtd" type="soa:ExternalSubset"/>
</xsd:choice>
</xsd:complexType>
<xsd:simpleType name="ExternalSubset">
<xsd:restriction base="asn1:UTF8String"/>
</xsd:simpleType>
</xsd:schema>
Normative References
[BCP14] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[ABNF] Crocker, D., and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", RFC 4234, October 2005.
[URI] Berners-Lee, T., Fielding, R. and L. Masinter, "Uniform
Resource Identifiers (URI): Generic Syntax", STD 66, RFC
3986, January 2005.
[BCP64] Zeilenga, K., "Internet Assigned Numbers Authority (IANA)
Considerations for the Lightweight Directory Access
Protocol (LDAP)", BCP 64, RFC 3383, September 2002.
[MODELS] Zeilenga, K., "LDAP: Directory Information Models",
draft-ietf-ldapbis-models-xx.txt, a work in progress,
February 2005.
[SYNTAX] Legg, S. and K. Dally, "Lightweight Directory Access
Protocol (LDAP): Syntaxes and Matching Rules",
draft-ietf-ldapbis-syntaxes-xx.txt, a work in progress,
June 2005.
[TRANSFER] Legg, S., "Lightweight Directory Access Protocol (LDAP):
Transfer Encoding Options",
draft-legg-ldap-transfer-xx.txt, a work in progress,
November 2005.
[ASN.X] Legg, S., "Abstract Syntax Notation X (ASN.X)",
draft-legg-xed-asd-xx.txt, a work in progress, November
2005.
[RXER] Legg, S. and D. Prager, "Robust XML Encoding Rules (RXER)
for Abstract Syntax Notation One (ASN.1)",
draft-legg-xed-rxer-xx.txt, a work in progress, October
2005.
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[RXEREI] Legg, S., "Encoding Instructions for the Robust XML
Encoding Rules (RXER)", draft-legg-xed-rxer-ei-xx.txt, a
work in progress, October 2005.
[X.501] ITU-T Recommendation X.501 (02/01) | ISO/IEC 9594-2:2001,
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] Draft Amendment 1 (to ITU-T Rec. X.680 | ISO/IEC 8824-1)
Support for EXTENDED-XER.
[XML10] Bray, T., Paoli, J., Sperberg-McQueen, C., Maler, E. and
F. Yergeau, "Extensible Markup Language (XML) 1.0 (Third
Edition)", W3C Recommendation,
http://www.w3.org/TR/2004/REC-xml-20040204, February 2004.
[XML11] Bray, T., Paoli, J., Sperberg-McQueen, C., Maler, E.,
Yergeau, F., and J. Cowan, "Extensible Markup Language
(XML) 1.1", W3C Recommendation,
http://www.w3.org/TR/2004/REC-xml11-20040204, February
2004.
[ISET] Cowan, J. and R. Tobin, "XML Information Set (Second
Edition)", W3C Recommendation,
http://www.w3.org/TR/2004/REC-xml-infoset-20040204,
February 2004.
[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.
Informative References
[XED] Legg, S. and D. Prager, "The XML Enabled Directory",
draft-legg-xed-roadmap-xx.txt, a work in progress,
February 2005.
[XLDAP] Legg, S. and D. Prager, "The XML Enabled Directory:
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Protocols", draft-legg-xed-protocols-xx.txt, a work in
progress, November 2005.
[CXSD] Legg, S. and D. Prager, "Translation of ASN.1
Specifications into XML Schema",
draft-legg-xed-xsd-xx.txt, a work in progress, to be
published.
[XSD0] Fallside, D., and P. Walmsley, "XML Schema Part 0: Primer
Second Edition", W3C Recommendation,
http://www.w3.org/TR/2004/REC-xmlschema-0-20041028/,
October 2004.
Authors' Addresses
Dr. Steven Legg
eB2Bcom
Suite 3, Woodhouse Corporate Centre
935 Station Street
Box Hill North, Victoria 3129
AUSTRALIA
Phone: +61 3 9896 7830
Fax: +61 3 9896 7801
EMail: steven.legg@eb2bcom.com
Dr. Daniel Prager
EMail: dan@layabout.net
Full Copyright Statement
Copyright (C) The Internet Society (2005).
This document is subject to the rights, licenses and restrictions
contained in BCP 78, and except as set forth therein, the authors
retain all their rights.
This document and the information contained herein are provided on an
"AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Intellectual Property
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The IETF takes no position regarding the validity or scope of any
Intellectual Property Rights or other rights that might be claimed to
pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights
might or might not be available; nor does it represent that it has
made any independent effort to identify any such rights. Information
on the procedures with respect to rights in RFC documents can be
found in BCP 78 and BCP 79.
Copies of IPR disclosures made to the IETF Secretariat and any
assurances of licenses to be made available, or the result of an
attempt made to obtain a general license or permission for the use of
such proprietary rights by implementers or users of this
specification can be obtained from the IETF on-line IPR repository at
http://www.ietf.org/ipr.
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.
Changes in Draft 01
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 <item> to <value> 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.
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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 <asn1:schema> element has been renamed to <asn1:module>.
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