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Versions: 00 01 02 03 RFC 4913

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

   By submitting this Internet-draft, each author represents that any
   applicable patent or other IPR claims of which he or she is aware
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   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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   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

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   The IETF invites any interested party to bring to its attention any



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   copyrights, patents or patent applications, or other proprietary
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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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