INTERNET-DRAFT S. Legg draft-legg-xed-asd-xerei-02.txt eB2Bcom Intended Category: Standards Track October 20, 2006 Abstract Syntax Notation X (ASN.X) Representation of Encoding Instructions for the XML Encoding Rules (XER) Copyright (C) The Internet Society (2006). 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 20 April 2007. Abstract Abstract Syntax Notation X (ASN.X) is an Extensible Markup Language (XML) representation for Abstract Syntax Notation One (ASN.1) specifications. This document specifies the ASN.X representation of encoding instructions for the XML Encoding Rules (XER). Legg Expires 20 April 2007 [Page 1] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 Table of Contents 1. Introduction ....................................................2 2. Conventions .....................................................3 3. Preprocessing of ImportedTypesIdentification ....................4 4. EncodingInstructionAssignmentList Translation ...................4 5. EncodingInstruction Translation .................................5 5.1. AnyAttributesInstruction Translation .......................6 5.1.1. NamespaceRestriction Translation ....................7 5.2. AnyElementInstruction Translation ..........................7 5.3. AttributeInstruction Translation ...........................7 5.4. Base64Instruction Translation ..............................7 5.5. DecimalInstruction Translation .............................8 5.6. DefaultForEmptyInstruction Translation .....................8 5.7. ElementInstruction Translation .............................8 5.8. EmbedValuesInstruction Translation .........................8 5.9. GlobalDefaultsInstruction Translation ......................8 5.10. ListInstruction Translation ...............................9 5.11. NameInstruction Translation ...............................9 5.12. NamespaceInstruction Translation .........................10 5.13. PIOrCommentInstruction Translation .......................10 5.14. TextInstruction Translation ..............................11 5.15. UntaggedInstruction Translation ..........................11 5.16. UseNilInstruction Translation ............................11 5.17. UseNumberInstruction Translation .........................11 5.18. UseOrderInstruction Translation ..........................11 5.19. UseQNameInstruction Translation ..........................12 5.20. UseTypeInstruction Translation ...........................12 5.21. UseUnionInstruction Translation ..........................12 5.22. WhiteSpaceInstruction Translation ........................12 6. TargetList Translation .........................................12 6.1. TypeIdentification Translation ............................13 6.2. BuiltInTypeIdentification Translation .....................14 6.3. IdentifiersInContext Translation ..........................16 7. Security Considerations ........................................17 8. IANA Considerations ............................................18 9. References .....................................................18 9.1. Normative References ......................................18 9.2. Informative References ....................................19 Appendix A. ASN.1 for XER Encoding Instruction Notation ...........19 Appendix B. ASN.1 for Target List Notation ........................23 Appendix C. ASN.X for XER Encoding Instruction Notation ...........25 Appendix D. ASN.X for Target List Notation ........................32 1. Introduction Abstract Syntax Notation X (ASN.X) [ASN.X] is an Extensible Markup Language (XML) [XML10][XML11] representation for Abstract Syntax Legg Expires 20 April 2007 [Page 2] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 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 EncodingInstruction and EncodingInstructionAssignmentList 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 XML Encoding Rules (XER) [X.693][X.693-1]. 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 that 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 ASN.1 basic notation, are provided elsewhere [ASN.X], however this document provides the ASN.1 type definitions for representing XER 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 Legg Expires 20 April 2007 [Page 3] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 that production. The description of the translation of XER encoding instructions into ASN.X makes use of definitions from the XML Information Set (Infoset) [ISET]. In particular, information item property names follow the Infoset convention of being shown in square brackets, 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 element item" means the element item with the [local name] "name". Attribute items will be referred to by their [local name], e.g., "the name attribute item" means the attribute item with the [local name] "name". Code points for characters [UNICODE] are expressed using the Unicode convention U+n, where n is four to six hexadecimal digits, e.g., the space character is U+0020. 3. Preprocessing of ImportedTypesIdentification Interpretation of an ImportedTypesIdentification depends on a SymbolList in the Imports of a module, but a SymbolList does not have a direct translation into ASN.X. A module containing an ImportedTypesIdentification must be preprocessed so that each ImportedTypesIdentification has the intended effect. If an EncodingInstruction in an XER EncodingInstructionAssignmentList has a Targets that is an ImportedTypesIdentification then each Type affected by the ImportedTypesIdentification MUST be replaced by an EncodingPrefixedType where the Type in the EncodingPrefixedType is the original Type and the EncodingPrefix contains the EncodingInstruction minus the TargetList. The ImportedTypesIdentification SHALL be removed. If the EncodingInstruction in the EncodingInstructionAssignmentList has no other Targets then it MUST be removed from the EncodingInstructionAssignmentList. 4. EncodingInstructionAssignmentList Translation As described in the specification for ASN.X [ASN.X], the translation of an EncodingControlSection for XER is an element item with the [local name] "XER". The translation of the EncodingInstructionAssignmentList in such an EncodingControlSection determines the content of the element item. An element item with the [local name] "annotation" MAY be added to the [children] of the element item. Legg Expires 20 April 2007 [Page 4] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 The translation of each EncodingInstruction in the EncodingInstructionAssignmentList SHALL be appended to the [children] of the element item. 5. EncodingInstruction Translation The translation of an EncodingInstruction for XER can appear in the translation of an EncodingInstructionAssignmentList (see the previous section) or an EncodingPrefix. The translation for an EncodingPrefix is described by the specification for ASN.X [ASN.X]. The translation of an EncodingInstruction in an EncodingInstructionAssignmentList for XER is an element with the [local name] "targettedInstruction". The translation of the PositiveInstruction or NegatingInstruction in the EncodingInstruction SHALL be added to the [children] of the element item. The translation of the TargetList within the encoding instruction SHALL be appended to the [children] of the element item. Aside: The TargetList appears within an EncodingInstruction in an EncodingInstructionAssignmentList, but its ASN.X translation appears immediately after the translation of the EncodingInstruction rather than within it. Example ENCODING-CONTROL XER GLOBAL-DEFAULTS MODIFIED-ENCODINGS ATTRIBUTE MyType The translation of an EncodingInstruction for XER in an EncodingPrefix is the translation of the contained PositiveInstruction or NegatingInstruction. Legg Expires 20 April 2007 [Page 5] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 Aside: The TargetList within an EncodingInstruction in an EncodingPrefix is required to be empty and has no ASN.X translation in this context. The translation of a PositiveInstruction is the translation of the contained AnyAttributeInstruction, AnyElementInstruction, AttributeInstruction, Base64Instruction, DecimalInstruction, DefaultForEmptyInstruction, EmbedValuesInstruction, GlobalDefaultsInstruction, ListInstruction, NameInstruction, NamespaceInstruction, PIOrCommentInstruction, TextInstruction, UntaggedInstruction, UseNilInstruction, UseNumberInstruction, UseOrderInstruction, UseQNameInstruction, UseTypeInstruction, UseUnionInstruction or WhitespaceInstruction. The translation of a NegatingInstruction that is an ElementInstruction is the translation of that ElementInstruction. The translation of a NegatingInstruction that is not an ElementInstruction is an element item where the [local name] is the concatenation of "not-" and the [local name] that would be used by the translation of the PositiveInstruction in the NegatingInstruction. No items are added to the [attributes] or [children] of the element item resulting from the translation of a NegatingInstruction. Example [XER:NOT ATTRIBUTE] MyType 5.1. AnyAttributesInstruction Translation The translation of an AnyAttributesInstruction is an element item with the [local name] "anyAttributes". If a NamespaceRestriction is present, then the translation of the NamespaceRestriction is added to the [children] of the element item. Example ANY-ATTRIBUTES FROM "http://example.com" ABSENT Legg Expires 20 April 2007 [Page 6] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 http://example.com 5.1.1. NamespaceRestriction Translation The NamespaceRestriction production is common to AnyAttributesInstruction and AnyElementInstruction. The translation of a NamespaceRestriction of the "FROM URIList" form is an element item with the [local name] "from". The translation of each QuotedURIorAbsent in the URIList is appended to the [children] of the element item. The translation of a NamespaceRestriction of the "EXCEPT URIList" form is an element item with the [local name] "except". The translation of each QuotedURIorAbsent in the URIList is appended to the [children] of the element item. The translation of a QuotedURIorAbsent that is a QuotedURI is an element item with the [local name] "namespace". The sequence of character items for the URI in the QuotedURI is added to the [children] of the element item. The translation of a QuotedURIorAbsent of the "ABSENT" form is an element item with the [local name] "local". 5.2. AnyElementInstruction Translation The translation of an AnyElementInstruction is an element item with the [local name] "anyElement". If a NamespaceRestriction is present, then the translation of the NamespaceRestriction is added to the [children] of the element item. 5.3. AttributeInstruction Translation The translation of an AttributeInstruction is an element item with the [local name] "attribute". Example ATTRIBUTE 5.4. Base64Instruction Translation The translation of a Base64Instruction is an element item with the Legg Expires 20 April 2007 [Page 7] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 [local name] "base64". 5.5. DecimalInstruction Translation The translation of a DecimalInstruction is an element item with the [local name] "decimal". 5.6. DefaultForEmptyInstruction Translation The translation of a DefaultForEmptyInstruction is an element item with the [local name] "defaultForEmpty". The translation of the Value in the DefaultForEmptyInstruction SHALL be added to the [children] or [attributes] of the element item. Example DEFAULT-FOR-EMPTY AS "unspecified" 5.7. ElementInstruction Translation The translation of an ElementInstruction is an element item with the [local name] "element". 5.8. EmbedValuesInstruction Translation The translation of an EmbedValuesInstruction is an element item with the [local name] "embedValues". 5.9. GlobalDefaultsInstruction Translation The translation of a GlobalDefaultsInstruction is an element item with the [local name] "globalDefaults". If the DefaultSetting in the GlobalDefaultsInstruction is "MODIFIED- ENCODINGS", then an element item with the [local name] "modifiedEncodings" SHALL be added to the [children] of the element item. If the DefaultSetting in the GlobalDefaultsInstruction is a ControlNamespace, then the translation of the ControlNamespace SHALL be added to the [children] of the element item. The translation of a ControlNamespace is an element item with the [local name] "controlNamespace". An attribute item with the [local name] "name" SHALL be added to the [attributes] of the element item. The [normalized value] of this Legg Expires 20 April 2007 [Page 8] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 attribute item is the Uniform Resource Identifier (URI) [URI] in the QuotedURI in the ControlNamespace. If the ControlNamespace contains a Prefix, then an attribute item with the [local name] "prefix" SHALL be added to the [attributes] of the element item. The [normalized value] of this attribute item is the NCName in the QuotedNCName in the Prefix. Example GLOBAL-DEFAULTS CONTROL-NAMESPACE "http://example.com" PREFIX "ex" 5.10. ListInstruction Translation The translation of a ListInstruction is an element item with the [local name] "list". 5.11. NameInstruction Translation The translation of a NameInstruction is an element item with the [local name] "name". If the NewNameOrKeyword in the NameInstruction is a NewName, then an attribute item with the [local name] "newName" SHALL be added to the [attributes] of the element item. The [normalized value] of this attribute item is the character string value of the NewName. If the NewNameOrKeyword in the NameInstruction is a Keyword, then an attribute item with the [local name] "conversion" SHALL be added to the [attributes] of the element item. The [normalized value] of this attribute item is the keyword in the Keyword with all letters downcased, i.e., "capitalized", "uncapitalized", "uppercased" or "lowercased". Example NAME AS UNCAPITALIZED NAME AS "category" Legg Expires 20 April 2007 [Page 9] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 5.12. NamespaceInstruction Translation The translation of a NamespaceInstruction is an element item with the [local name] "namespace". If a NamespaceSpecification is present, then an attribute item with the [local name] "name" SHALL be added to the [attributes] of the element item. The [normalized value] of this attribute item is the URI in the QuotedURI in the NamespaceSpecification. If a Prefix is present in the NamespaceSpecification, then an attribute item with the [local name] "prefix" SHALL be added to the [attributes] of the element item. The [normalized value] of this attribute item is the NCName in the QuotedNCName in the Prefix. Example NAMESPACE AS "http://example.com" PREFIX "ex" 5.13. PIOrCommentInstruction Translation The translation of a PIOrCommentInstruction is an element item with the [local name] "piOrComment". An attribute item with the [local name] "text" SHALL be added to the [attributes] of the element item. The [normalized value] of this attribute item is the character string value of the RestrictedCharacterStringValue in the PIOrCommentInstruction. An attribute item with the [local name] "position" SHALL be added to the [attributes] of the element item. The [normalized value] of this attribute item is "beforeTag" if the keyword in the Position in the PIOrCommentInstruction is BEFORE-TAG, "beforeValue" if the keyword in the Position is BEFORE-VALUE, "afterTag" if the keyword in the Position is AFTER-TAG, or "afterValue" if the keyword in the Position is AFTER-VALUE. Example PI-OR-COMMENT AS "" BEFORE-TAG Legg Expires 20 April 2007 [Page 10] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 5.14. TextInstruction Translation The translation of a TextInstruction is an element item with the [local name] "text". If a TextToBeUsed is present in the TextInstruction and the NewNameOrKeyword in the TextToBeUsed is a NewName, then an attribute item with the [local name] "newName" SHALL be added to the [attributes] of the element item. The [normalized value] of this attribute item is the character string value of the NewName. If a TextToBeUsed is present in the TextInstruction and the NewNameOrKeyword in the TextToBeUsed is a Keyword, then an attribute item with the [local name] "conversion" SHALL be added to the [attributes] of the element item. The [normalized value] of this attribute item is the keyword in the Keyword with all letters downcased, i.e., "capitalized", "uncapitalized", "uppercased" or "lowercased". Examples TEXT AS UPPERCASED TEXT AS "A4" 5.15. UntaggedInstruction Translation The translation of an UntaggedInstruction is an element item with the [local name] "untagged". 5.16. UseNilInstruction Translation The translation of a UseNilInstruction is an element item with the [local name] "useNil". 5.17. UseNumberInstruction Translation The translation of a UseNumberInstruction is an element item with the [local name] "useNumber". 5.18. UseOrderInstruction Translation The translation of a UseOrderInstruction is an element item with the [local name] "useOrder". Legg Expires 20 April 2007 [Page 11] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 5.19. UseQNameInstruction Translation The translation of a UseQNameInstruction is an element item with the [local name] "useQName". 5.20. UseTypeInstruction Translation The translation of a UseTypeInstruction is an element item with the [local name] "useType". 5.21. UseUnionInstruction Translation The translation of a UseUnionInstruction is an element item with the [local name] "useUnion". 5.22. WhiteSpaceInstruction Translation The translation of a WhiteSpaceInstruction is an element item with the [local name] "whiteSpace". If a WhiteSpaceAction is present in the WhiteSpaceInstruction, then An attribute item with the [local name] "action" SHALL be added to the [attributes] of the element item. The [normalized value] of this attribute item is the keyword in the WhiteSpaceAction in the WhiteSpaceInstruction with all letters downcased, i.e., "replace" or "collapse". Example WHITESPACE COLLAPSE 6. TargetList Translation The TargetList production is common to all the encoding instructions. The translation of a TargetList is the concatenation of the translations of each of the contained Targets. The translation of a Targets is an element item with the [local name] "target". The translation of the contained TypeIdentification, BuiltInTypeIdentification or IdentifiersInContext SHALL be added to the [children] and/or [attributes] of the element item. Aside: A Targets that is an ImportedTypesIdentification will have been removed by the preprocessing described in Section 3. Legg Expires 20 April 2007 [Page 12] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 6.1. TypeIdentification Translation The translation of a TypeIdentification of the "ALL" form is an element item with the [local name] "allTypes", otherwise the translation of a TypeIdentification is the translation of the ModuleAndTypeReference followed by the translation of the ComponentReference, if present, followed by the translation of the QualifyingInformationPart, if present. The translation of a ModuleAndTypeReference is an attribute item with the [local name] "type". The [normalized value] of this attribute item is the qualified name [XMLNS10] corresponding to the typereference in the ModuleAndTypeReference (see Section 5.1 of the specification for ASN.X [ASN.X]). The translation of a ComponentReference is an element item with the [local name] "component" and, if the final ComponentId in the ComponentIdList in the ComponentReference is "ALL", an element item with the [local name] "allTextuallyPresent". The [children] property of the element item is set to the sequence of character items for a "/" (U+002F) separated list of the translations of the ComponentId instances, excluding "ALL" if present. Leading and/or trailing white space character items MAY be added to the [children] of the element item. White space character items MAY be added immediately before and/or after any character item for the "/" character. If a ComponentId identifies the Type in a NamedType, then the translation of the ComponentId is the RXER character data translation [RXER] of the effective name [RXEREI] of the NamedType. If the NamedType is subject to an RXER ATTRIBUTE or ATTRIBUTE-REF encoding instruction [RXEREI], then a "@" (U+0040) character is prefixed to the translation. If a ComponentId identifies a Type that is not in a NamedType (the component type for a SEQUENCE OF or SET OF type), then the translation of the ComponentId is the character string "item". If a ComponentId does not identify a Type and the ComponentId is an identifier, then the translation of the ComponentId is the identifier. If a ComponentId does not identify a Type and the ComponentId is "*", then the translation of the ComponentId is the character string "item". The element item is required to be self-contained [RXER]. Legg Expires 20 April 2007 [Page 13] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 Aside: An element item is self-contained if all namespace prefixes used by the element item and its contents are declared within the element item. The translation of a QualifyingInformationPart is the translation of the contained QualifyingInformation. The translation of a QualifyingInformation of the "identifier" form is an element item with the [local name] "identifier". An attribute item with the [local name] "name" SHALL be added to the [attributes] of the element item. If the ModuleTypeAndReference and ComponentReference (if present) identify a BIT STRING, ENUMERATED, or INTEGER type where the associated BitStringType, EnumeratedType or IntegerType (respectively) is subject to an RXER VALUES encoding instruction, then the [normalized value] of the attribute item is the replacement name [RXEREI] for the identifier, otherwise the [normalized value] is the identifier. The translation of a QualifyingInformation of the "ALL" form is an element item with the [local name] "allIdentifiers". Examples Assume this type assignment: MyType ::= SEQUENCE { a SEQUENCE OF CHOICE { b ENUMERATED { red, green, blue }, c INTEGER } } MyType.a.*.ALL a / item MyType.a.*.b:ALL a / item / b 6.2. BuiltInTypeIdentification Translation Legg Expires 20 April 2007 [Page 14] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 The translation of a BuiltInTypeIdentification is the translation of the BuiltInTypeName followed by the translation of the BuiltInTypeQualifyingInformationPart, if present. If the BuiltInTypeName is "BIT STRING", "BOOLEAN", "CHARACTER STRING", "EMBEDDED PDV", "EXTERNAL", "GeneralizedTime", "INTEGER", "NULL", "ObjectDescriptor", "OBJECT IDENTIFIER", "OCTET STRING", "REAL", "RELATIVE-OID" or "UTCTime", then the translation of the BuiltInTypeName is an attribute item with the [local name] "type". The [normalized value] of this attribute item is a qualified name with the namespace name being "urn:ietf:params:xml:ns:asnx" and the local part being the BuiltInTypeName with any white space separators replaced by a single hyphen character (U+002D), e.g. BIT STRING becomes BIT-STRING. If the BuiltInTypeName is a RestrictedCharacterStringType, then the translation of the BuiltInTypeName is an attribute item with the [local name] "type". The [normalized value] of this attribute item is a qualified name with the namespace name being "urn:ietf:params:xml:ns:asnx" and the local part being the RestrictedCharacterStringType, i.e., BMPString, GeneralString, GraphicString, IA5String, ISO646String, NumericString, PrintableString, TeletexString, T61String, UniversalString, UTF8String, VideotexString or VisibleString. If the BuiltInTypeName is "CHOICE", then the translation of the BuiltInTypeName is an element item with the [local name] "choice". If the BuiltInTypeName is "ENUMERATED", then the translation of the BuiltInTypeName is an element item with the [local name] "enumerated". If the BuiltInTypeName is "INSTANCE OF", then the translation of the BuiltInTypeName is an element item with the [local name] "instanceOf". If the BuiltInTypeName is "SEQUENCE", then the translation of the BuiltInTypeName is an element item with the [local name] "sequence". If the BuiltInTypeName is "SEQUENCE OF", then the translation of the BuiltInTypeName is an element item with the [local name] "sequenceOf". If the BuiltInTypeName is "SET", then the translation of the BuiltInTypeName is an element item with the [local name] "set". If the BuiltInTypeName is "SET OF", then the translation of the BuiltInTypeName is an element item with the [local name] "setOf". Legg Expires 20 April 2007 [Page 15] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 The translation of a BuiltInTypeQualifyingInformationPart is the translation of the contained BuiltInTypeQualifyingInformation. The translation of a BuiltInTypeQualifyingInformation of the "identifier" form is an element item with the [local name] "identifier". An attribute item with the [local name] "name" SHALL be added to the [attributes] of the element item. The [normalized value] of this attribute item is the actual identifier. The translation of a BuiltInTypeQualifyingInformationPart of the "ALL" form is an element item with the [local name] "allIdentifiers". Examples BOOLEAN:true ENUMERATED:ALL 6.3. IdentifiersInContext Translation The translation of an IdentifiersInContext is an element item with the [local name] "components". If the IdentifierList in the IdentifiersInContext is not of the "ALL" or "COMPONENTS" form, then for each identifier in the IdentifierList, an element item with the same [local name] (i.e., "attribute", "element", "component", "group", "member" or "item") as the translation of the NamedType corresponding to the identifier SHALL be appended to the [children] of the element item. An attribute item with the [local name] "name" SHALL be added to the [attributes] of each , , , , or element item, as the case may be. The [normalized value] of each of these attribute items is the RXER character data translation [RXER] of the effective name [RXEREI] of the NamedType corresponding to the identifier. If the IdentifierList in the IdentifiersInContext is of the "ALL" form, then an element item with the [local name] Legg Expires 20 April 2007 [Page 16] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 "allTextuallyPresent" SHALL be appended to the [children] of the element item. If the IdentifierList in the IdentifiersInContext is of the "COMPONENTS" form, then an element item with the [local name] "allFirstLevel" SHALL be appended to the [children] of the element item. An element item with the [local name] "in" SHALL be appended to the [children] of the element item. The translation of the TypeIdentification in the IdentifiersInContext SHALL be added to the [children] and/or [attributes] of the element item. Example Assume this type assignment: MyType ::= SEQUENCE { field INTEGER, fieldAtt [RXER:NAME AS "field"][RXER:ATTRIBUTE] BOOLEAN } field, fieldAtt IN MyType 7. Security Considerations The ASN.X translation of an XER encoding instruction is semantically equivalent to the original XER encoding instruction. The security considerations that apply to an application built from an original ASN.1 specification with XER encoding instructions apply equally to an application built from the ASN.X translation of the ASN.1 specification. Syntax-based canonicalization for XML documents (e.g., Canonical XML [CXML]) depends on the Infoset of an XML document being preserved. However, the Infoset representation of an ASN.X document (an abstract value of the ModuleDefinition ASN.1 type) potentially changes if it is decoded and re-encoded, disrupting the Canonical XML representation. To avoid this problem, ASN.X documents must be normalized prior to the application of syntax-based canonicalization. Legg Expires 20 April 2007 [Page 17] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 The normalization rules can be found in Section 5.12 of the specification for RXER [RXER]. 8. IANA Considerations This document has no actions for 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. [URI] Berners-Lee, T., Fielding, R. and L. Masinter, "Uniform Resource Identifiers (URI): Generic Syntax", STD 66, RFC 3986, January 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 2006. [RXEREI] Legg, S., "Encoding Instructions for the Robust XML Encoding Rules (RXER)", draft-legg-xed-rxer-ei-xx.txt, a work in progress, October 2006. [ASN.X] Legg, S., "Abstract Syntax Notation X (ASN.X)", draft-legg-xed-asd-xx.txt, a work in progress, October 2006. [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. [X.683] ITU-T Recommendation X.683 (07/02) | ISO/IEC 8824-4, Information technology - Abstract Syntax Notation One (ASN.1): Parameterization of ASN.1 specifications. [X.693-1] Amendment 1: (to ITU-T Rec. X.693 | ISO/IEC 8825-4) XER encoding instructions and 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, Legg Expires 20 April 2007 [Page 18] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 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. [XMLNS10] Bray, T., Hollander, D., Layman, A., and R. Tobin, "Namespaces in XML 1.0 (Second Edition)", W3C Recommendation, http://www.w3.org/TR/2006/REC-xml-names-20060816, August 2006. [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. [UNICODE] The Unicode Consortium, "The Unicode Standard, Version 4.0", Boston, MA, Addison-Wesley Developers Press, 2003. ISBN 0-321-18578-1. 9.2. Informative References [X.693] ITU-T Recommendation X.693 (12/01) | ISO/IEC 8825-4:2002, Information technology - ASN.1 encoding rules: XML encoding rules (XER) Appendix A. ASN.1 for XER Encoding Instruction Notation This appendix is normative. XER-EncodingInstructionNotation { iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) xmled(21472) asnx(1) module(0) xer-ei-notation(3) } -- Copyright (C) The Internet Society (2006). 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 AnyURI, Legg Expires 20 April 2007 [Page 19] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 NCName FROM AdditionalBasicDefinitions { iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) xmled(21472) asnx(1) module(0) basic(0) } Annotation, Value FROM AbstractSyntaxNotation-X { iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) xmled(21472) asnx(1) module(0) notation(1) } TargetList FROM TargetListNotation { iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) xmled(21472) asnx(1) module(0) target-list-notation(4) } ; XER-EncodingInstructionAssignmentList ::= SEQUENCE { annotation Annotation OPTIONAL, instructions [GROUP] XER-TargettedEncodingInstructions } XER-TargettedEncodingInstructions ::= SEQUENCE SIZE (1..MAX) OF targettedInstruction XER-TargettedEncodingInstruction XER-TargettedEncodingInstruction ::= SEQUENCE { instruction [GROUP] XER-GeneralEncodingInstruction, targetList [GROUP] TargetList OPTIONAL } XER-EncodingInstruction ::= XER-GeneralEncodingInstruction (WITH COMPONENTS { ..., globalDefaults ABSENT }) XER-GeneralEncodingInstruction ::= [SINGULAR-INSERTIONS] CHOICE { anyAttributes XER-WildcardInstruction, not-anyAttributes XER-NegatingInstruction, anyElement XER-WildcardInstruction, not-anyElement XER-NegatingInstruction, attribute XER-SimpleInstruction, not-attribute XER-NegatingInstruction, base64 XER-SimpleInstruction, not-base64 XER-NegatingInstruction, decimal XER-SimpleInstruction, not-decimal XER-NegatingInstruction, defaultForEmpty XER-DefaultForEmptyInstruction, not-defaultForEmpty XER-NegatingInstruction, Legg Expires 20 April 2007 [Page 20] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 embedValues XER-SimpleInstruction, not-embedValues XER-NegatingInstruction, globalDefaults XER-GlobalDefaultsInstruction, list XER-SimpleInstruction, not-list XER-NegatingInstruction, name XER-NameInstruction, not-name XER-NegatingInstruction, namespace XER-NamespaceInstruction, not-namespace XER-NegatingInstruction, piOrComment XER-PIOrCommentInstruction, not-piOrComment XER-NegatingInstruction, text XER-TextInstruction, not-text XER-NegatingInstruction, untagged XER-SimpleInstruction, not-untagged XER-NegatingInstruction, element XER-NegatingInstruction, useNil XER-SimpleInstruction, not-useNil XER-NegatingInstruction, useNumber XER-SimpleInstruction, not-useNumber XER-NegatingInstruction, useOrder XER-SimpleInstruction, not-useOrder XER-NegatingInstruction, useQName XER-SimpleInstruction, not-useQName XER-NegatingInstruction, useType XER-SimpleInstruction, not-useType XER-NegatingInstruction, useUnion XER-SimpleInstruction, not-useUnion XER-NegatingInstruction, whiteSpace XER-WhiteSpaceInstruction, not-whiteSpace XER-NegatingInstruction } XER-SimpleInstruction ::= SEQUENCE { } XER-NegatingInstruction ::= XER-SimpleInstruction XER-WildcardInstruction ::= SEQUENCE { namespaceRestriction [GROUP] XER-NamespaceRestriction OPTIONAL } XER-NamespaceRestriction ::= [NO-INSERTIONS] CHOICE { from XER-URIList, except XER-URIList } XER-URIList ::= SEQUENCE SIZE(1..MAX) OF uriOrAbsent [GROUP] XER-QuotedURIorAbsent Legg Expires 20 April 2007 [Page 21] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 XER-QuotedURIorAbsent ::= [SINGULAR-INSERTIONS] CHOICE { namespace AnyURI, local NULL } XER-DefaultForEmptyInstruction ::= SEQUENCE { value [GROUP] Value } XER-GlobalDefaultsInstruction ::= SEQUENCE { defaultSetting [GROUP] [SINGULAR-INSERTIONS] CHOICE { modifiedEncodings NULL, controlNamespace XER-ControlNamespace } } XER-ControlNamespace ::= SEQUENCE { name [ATTRIBUTE] AnyURI, prefix [ATTRIBUTE] NCName OPTIONAL } XER-NameInstruction ::= SEQUENCE { newNameOrKeyword [GROUP] XER-NewNameOrKeyword } XER-NewNameOrKeyword ::= [NO-INSERTIONS] CHOICE { newName [ATTRIBUTE] UTF8String, conversion [ATTRIBUTE] XER-Conversion } XER-Conversion ::= ENUMERATED { capitalized (0), uncapitalized (1), uppercased (2), lowercased (3) } XER-NamespaceInstruction ::= SEQUENCE { namespace [GROUP] XER-NamespaceSpecification OPTIONAL } XER-NamespaceSpecification ::= [HOLLOW-INSERTIONS] SEQUENCE { name [ATTRIBUTE] AnyURI, prefix [ATTRIBUTE] NCName OPTIONAL } XER-PIOrCommentInstruction ::= SEQUENCE { text [ATTRIBUTE] UTF8String, Legg Expires 20 April 2007 [Page 22] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 position [ATTRIBUTE] XER-Position } XER-Position ::= ENUMERATED { beforeTag (0), beforeValue (1), afterValue (2), afterTag (3) } XER-TextInstruction ::= SEQUENCE { newNameOrKeyword [GROUP] XER-NewNameOrKeyword OPTIONAL } XER-WhiteSpaceInstruction ::= SEQUENCE { action [ATTRIBUTE] XER-WhiteSpaceAction } XER-WhiteSpaceAction ::= ENUMERATED { replace (0), collapse (1) } ENCODING-CONTROL RXER SCHEMA-IDENTITY "urn:oid:1.3.6.1.4.1.21472.1.0.3" TARGET-NAMESPACE "urn:ietf:params:xml:ns:asnx" PREFIX "asnx" END Appendix B. ASN.1 for Target List Notation This appendix is normative. TargetListNotation { iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) xmled(21472) asnx(1) module(0) target-list-notation(4) } -- Copyright (C) The Internet Society (2006). 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 Legg Expires 20 April 2007 [Page 23] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 IMPORTS Markup, NCName, QName FROM AdditionalBasicDefinitions { iso(1) identified-organization(3) dod(6) internet(1) private(4) enterprise(1) xmled(21472) asnx(1) module(0) basic(0) } ; TargetList ::= SEQUENCE SIZE (1..MAX) OF target Targets Targets ::= [NO-INSERTIONS] CHOICE { allTypes NULL, identifiedTypes [GROUP] QualifiedTypeIdentification, components IdentifiersInContext, allImportsFrom SEQUENCE { } -- allImportsFrom is not used in this version } -- TypeIdentification and BuiltInTypeIdentification QualifiedTypeIdentification ::= [HOLLOW-INSERTIONS] SEQUENCE { types [GROUP] [SINGULAR-INSERTIONS] CHOICE { specificType [GROUP] SpecificTypeIdentification, choice NULL, enumerated NULL, instanceOf NULL, sequence NULL, sequenceOf NULL, set NULL, setOf NULL }, qualification [GROUP] QualifyingInformationPart OPTIONAL } SpecificTypeIdentification ::= [HOLLOW-INSERTIONS] SEQUENCE { type [ATTRIBUTE] QName, component Markup OPTIONAL, allTextuallyPresent NULL OPTIONAL } QualifyingInformationPart ::= [NO-INSERTIONS] CHOICE { allIdentifiers NULL, identifier SEQUENCE { name [ATTRIBUTE] NCName } } Legg Expires 20 April 2007 [Page 24] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 IdentifiersInContext ::= SEQUENCE { identifiers [GROUP] IdentifierList, in CHOICE { allTypes NULL, specificType [GROUP] SpecificTypeIdentification } } IdentifierList ::= [NO-INSERTIONS] CHOICE { list [GROUP] IdentifiedComponents, allTextuallyPresent NULL, allFirstLevel NULL } IdentifiedComponents ::= SEQUENCE SIZE (1..MAX) OF identifiedComponent [GROUP] IdentifiedComponent IdentifiedComponent ::= [SINGULAR-INSERTIONS] CHOICE { component GenericIdentifiedComponent, element GenericIdentifiedComponent, attribute GenericIdentifiedComponent, group GenericIdentifiedComponent, member GenericIdentifiedComponent, item GenericIdentifiedComponent } GenericIdentifiedComponent ::= SEQUENCE { name [ATTRIBUTE] QName } ENCODING-CONTROL RXER SCHEMA-IDENTITY "urn:oid:1.3.6.1.4.1.21472.1.0.4" TARGET-NAMESPACE "urn:ietf:params:xml:ns:asnx" PREFIX "tln" END Appendix C. ASN.X for XER Encoding Instruction Notation This appendix is non-normative. Copyright (C) The Internet Society (2006). This version of this ASN.X module is part of RFC XXXX; see the RFC itself for full legal notices. Legg Expires 20 April 2007 [Page 26] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 Legg Expires 20 April 2007 [Page 28] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 Legg Expires 20 April 2007 [Page 29] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 Legg Expires 20 April 2007 [Page 30] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 Legg Expires 20 April 2007 [Page 31] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 Appendix D. ASN.X for Target List Notation This appendix is non-normative. Copyright (C) The Internet Society (2006). This version of this ASN.X module is part of RFC XXXX; see the RFC itself for full legal notices. Legg Expires 20 April 2007 [Page 32] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 allImportsFrom is not used in this version TypeIdentification and BuiltInTypeIdentification Legg Expires 20 April 2007 [Page 33] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 Legg Expires 20 April 2007 [Page 34] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 Author's Address Dr. Steven Legg eB2Bcom Suite 3, Woodhouse Corporate Centre 935 Station Street Box Hill North, Victoria 3129 AUSTRALIA Legg Expires 20 April 2007 [Page 35] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 Phone: +61 3 9896 7830 Fax: +61 3 9896 7801 EMail: steven.legg@eb2bcom.com Full Copyright Statement Copyright (C) The Internet Society (2006). 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 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. Note to the RFC Editor: the remainder of this document is to be removed before final publication. Changes in Draft 01 Legg Expires 20 April 2007 [Page 36] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 ASN.1 Schema has been renamed to Abstract Syntax Notation X (ASN.X) and the element has been renamed to . The XER-EncodingInstructionSchema module has been renamed to XER-EncodingInstructionNotation. The schema identity for the module has been similarly changed. The component attribute in the SpecificTypeIdentification translation has been changed to a element. Examples have been added. The CONTENT encoding instruction has been renamed to GROUP and a component subject to a GROUP encoding instruction is now an element item with the [local name] "group" instead of "content". The element has been renamed to and now appears as a child element of an element. Insertion encoding instructions have been added to the ASN.1 for XER Encoding Instruction Notation to remove extension ambiguity. Changes in Draft 02 The AnyType ASN.1 type has been renamed to Markup. Each EncodingInstruction in an EncodingInstructionAssignmentList is now wrapped in a element with the elements following the encoding instruction element instead of being nested within it. This is better aligned with the improved syntax for XER encoding instructions that will be introduced along with encoding instructions for PER. The ASN.1 for TargetList has been extracted into a separate ASN.1 module so that it can be more conveniently shared with encoding instructions for PER. The method for dealing with parameterized definitions has been generalized for ASN.X, so a specific solution for module context changes with respect to XER encoding instructions is no longer needed and has been dropped. The treatment of the GLOBAL-DEFAULTS encoding instruction has been changed so that there is now an explicit element item. A negating instruction is now represented as an empty element item with a name beginning with "not-" instead of being represented as a Legg Expires 20 April 2007 [Page 37] INTERNET-DRAFT ASN.X: XER Encoding Instructions October 20, 2006 positive instruction child of a element item. A preprocessing step has been added to deal with ImportedTypesIdentification. The previous translation for ImportedTypesIdentification was unable to account for symbols imported from another module's import list. The URL for the ASN.1 namespace has been replaced. A permanent URN will be requested from IANA. Legg Expires 20 April 2007 [Page 38]