One document matched: draft-legg-xed-asd-gserei-01.txt
Differences from draft-legg-xed-asd-gserei-00.txt
INTERNET-DRAFT S. Legg
draft-legg-xed-asd-gserei-01.txt eB2Bcom
Intended Category: Standards Track November 11, 2005
Abstract Syntax Notation X (ASN.X) Representation
of Encoding Instructions for
the Generic String Encoding Rules (GSER)
Copyright (C) The Internet Society (2005).
Status of this Memo
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This Internet-Draft expires on 11 May 2006.
Abstract
Abstract Syntax Notation X (ASN.X) is an Extensible Markup Language
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(XML) representation for Abstract Syntax Notation One (ASN.1)
specifications. This document specifies the ASN.X representation of
encoding instructions for the Generic String Encoding Rules (GSER).
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. EncodingInstructionAssignmentList Translation. . . . . . . . . 4
4. EncodingInstruction Translation. . . . . . . . . . . . . . . . 4
4.1. ChoiceOfStringsInstruction Translation . . . . . . . . . 5
5. Security Considerations. . . . . . . . . . . . . . . . . . . . 5
6. IANA Considerations. . . . . . . . . . . . . . . . . . . . . . 6
Appendix A. ASN.1 for GSER Encoding Instruction Notation . . . . . 6
Appendix B. ASN.X for GSER Encoding Instruction Notation . . . . . 7
Normative References . . . . . . . . . . . . . . . . . . . . . . . 8
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 9
Full Copyright Statement . . . . . . . . . . . . . . . . . . . . . 9
1. Introduction
Abstract Syntax Notation X (ASN.X) [ASN.X] is an Extensible Markup
Language (XML) [XML10] representation for Abstract Syntax Notation
One (ASN.1) [X.680] specifications. The ASN.X representation for the
ASN.1 basic notation [X.680] [X.680-1] is described elsewhere
[ASN.X].
The grammar of ASN.1 also permits the application of encoding
instructions [X.680-1], through type prefixes and encoding control
sections, that modify how abstract values are encoded by nominated
encoding rules.
The generic notation for type prefixes and encoding control sections
is defined by the ASN.1 basic notation, however the notation for
specific encoding instructions i.e., the
EncodingInstructionAssignmentList and EncodingInstruction productions
of the notation, are defined separately for each set of encoding
rules using encoding instructions. This document specifies the ASN.X
representation for EncodingInstructionAssignmentList and
EncodingInstruction as they are defined for the Generic String
Encoding Rules (GSER) [GSER][GSEREI].
ASN.X is defined in terms of rules for translating from an ASN.1
specification. This does not preclude an ASN.X document being
written directly without a pre-existing ASN.1 specification, however
such an ASN.X document is considered valid if and only if there
exists in principle an ASN.1 specification which when translated
would yield the ASN.X document.
By design, an ASN.X document is also the Robust XML Encoding Rules
(RXER) [RXER] encoding of an ASN.1 abstract value. The ASN.1 type
definitions for such abstract values, insofar as they pertain to the
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ASN.1 basic notation, are provided elsewhere [ASN.X], however this
document provides the ASN.1 type definitions for representing GSER
encoding instructions as abstract values. These definitions appear
in Appendix A.
The ASN.X translation of the ASN.1 module in Appendix A is presented
in Appendix B.
The General Considerations of the specification for ASN.X [ASN.X]
also apply here.
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.
A reference to an ASN.1 production [X.680] (e.g., Type, NamedType) is
a reference to the text in an ASN.1 specification corresponding to
that production.
The description of the translation of GSER encoding instructions into
ASN.X 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,
"information item" will be abbreviated to "item", e.g., "element
information item" is abbreviated to "element item". Element items
will be referred to by their [local name] in angle brackets, e.g.,
"the <type> element item" means the element item with the
[local name] "type".
3. EncodingInstructionAssignmentList Translation
As described in the specification for ASN.X [ASN.X], the translation
of an EncodingControlSection for GSER is an element item with the
[local name] "GSER". The translation of the
EncodingInstructionAssignmentList in such an EncodingControlSection
determines the content of the <GSER> element item.
The EncodingInstructionAssignmentList for GSER is currently defined
to be empty [GSEREI] therefore the [attributes] and [children] of the
<GSER> element item are both empty.
4. EncodingInstruction Translation
The translation of an EncodingInstruction for GSER can appear in an
EncodingPrefix. The translation for an EncodingPrefix is described
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by the specification for ASN.X.
The translation of an EncodingInstruction for GSER is the translation
of the contained ChoiceOfStringsInstruction (currently the only
defined encoding instruction for GSER).
4.1. ChoiceOfStringsInstruction Translation
The translation of a ChoiceOfStringsInstruction is an element item
with the [local name] "choiceOfStrings".
If the ChoiceOfStringsInstruction has a PrecedenceList then an
attribute item with the [local name] "precedence" SHALL be added to
the [attributes] of the <choiceOfStrings> element item. The
[normalized value] of this attribute item is the white space
separated list of the RXER encodings [RXER] of the effective names
[RXEREI] of the NamedType instances corresponding to the identifiers
in the PrecedenceList.
Example
[GSER:CHOICE-OF-STRINGS PRECEDENCE utf8 visible] CHOICE {
visible [RXER:NAME AS "ascii"] VisibleString,
utf8 UTF8String
}
<type xmlns:asn1="http://xmled.info/ns/ASN.1">
<prefixed>
<GSER><choiceOfStrings precedence="utf8 ascii"/></GSER>
<type>
<choice>
<element name="ascii" identifier="visible"
type="asn1:VisibleString"/>
<element name="utf8" type="asn1:UTF8String"/>
</choice>
</type>
</prefixed>
</type>
5. Security Considerations
The ASN.X translation of a GSER encoding instruction is semantically
equivalent to the original GSER encoding instruction. The security
considerations that apply to an application built from an original
ASN.1 specification with GSER encoding instructions apply equally to
an application built from the ASN.X translation of the ASN.1
specification.
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6. IANA Considerations
This document has no actions for IANA.
Appendix A. ASN.1 for GSER Encoding Instruction Notation
This appendix is normative.
GSER-EncodingInstructionNotation
{ iso(1) identified-organization(3) dod(6)
internet(1) private(4) enterprise(1)
xmled(21472) asn1(1) module(0) gser-ei-notation(2) }
-- 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
AUTOMATIC TAGS
EXTENSIBILITY IMPLIED ::= BEGIN
IMPORTS
PrecedenceList
FROM AbstractSyntaxNotation-X
{ iso(1) identified-organization(3) dod(6)
internet(1) private(4) enterprise(1)
xmled(21472) asn1(1) module(0) notation(1) }
;
GSER-EncodingInstruction ::= [SINGULAR-INSERTIONS] CHOICE {
choiceOfStrings GSER-ChoiceOfStringsInstruction
}
GSER-EncodingInstructionAssignmentList ::= SEQUENCE { }
GSER-ChoiceOfStringsInstruction ::= SEQUENCE {
precedence [ATTRIBUTE] PrecedenceList OPTIONAL
}
ENCODING-CONTROL RXER
SCHEMA-IDENTITY
"http://xmled.info/id/ASN.1/GSER-EncodingInstructionNotation"
TARGET-NAMESPACE "http://xmled.info/ns/ASN.1"
END
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Appendix B. ASN.X for GSER Encoding Instruction Notation
This appendix is non-normative.
<?xml version="1.0"?>
<asn1:module
xmlns:asn1="http://xmled.info/ns/ASN.1"
xmlns:asnx="http://xmled.info/ns/ASN.1"
name="GSER-EncodingInstructionNotation"
identifier="1.3.6.1.4.1.21472.1.0.2"
schemaIdentity=
"http://xmled.info/id/ASN.1/GSER-EncodingInstructionNotation"
xmlns:gser="http://xmled.info/ns/ASN.1"
targetNamespace="http://xmled.info/ns/ASN.1"
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="AbstractSyntaxNotation-X"
identifier="1.3.6.1.4.1.21472.1.0.1"
schemaIdentity=
"http://xmled.info/id/ASN.1/AbstractSyntaxNotation-X"
namespace="http://xmled.info/ns/ASN.1"/>
<namedType name="GSER-EncodingInstruction">
<type insertions="singular">
<choice>
<element name="choiceOfStrings"
type="gser:GSER-ChoiceOfStringsInstruction"/>
</choice>
</type>
</namedType>
<namedType name="GSER-EncodingInstructionAssignmentList">
<type>
<sequence/>
</type>
</namedType>
<namedType name="GSER-ChoiceOfStringsInstruction">
<type>
<sequence>
<optional>
<attribute name="precedence" type="asnx:PrecedenceList"/>
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</optional>
</sequence>
</type>
</namedType>
</asn1:module>
Normative References
[BCP14] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[GSER] Legg, S., "Generic String Encoding Rules (GSER) for ASN.1
Types", RFC 3641, October 2003.
[GSEREI] Legg, S., "Encoding Instructions for the Generic String
Encoding Rules (GSER)", draft-legg-ldap-gser-ei-xx.txt, a
work in progress, October 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.
[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.
[ASN.X] Legg, S., "Abstract Syntax Notation X (ASN.X)",
draft-legg-xed-asd-xx.txt, a work in progress, November
2005.
[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.
[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.
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Author's Address
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
Full Copyright Statement
Copyright (C) The Internet Society (2005).
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Changes in Draft 01
The <encodingControl-GSER> element has been renamed to <GSER> and now
appears as a child element of an <encodingControls> element.
An insertion encoding instruction has been added to the ASN.1 for
GSER Encoding Instruction Notation to remove extension ambiguity.
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