1、 Copyright 2009 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10607 (914) 761-1100 Approved March 10, 2009 Table of Contents Page Foreword 2 Intellectual Property .2 1 Scope .3 2 Conformance Notation .3 3 Normative References .3 4 Definition of Acronyms
2、and Terms.4 5 Uniform Resource Name General Syntax (Informative) 4 6 SMPTE URN Namespace Policies 4 7 Uniform Resource Names for Universal Labels.4 7.1 UL URN NSS 4 7.2 UL URN Examples (Informative).5 8 Uniform Resource Names for Unique Material Identifiers .5 8.1 UMID URN NSS5 8.2 UMID URN Examples
3、 (Informative)5 Annex A Bibliography (Informative) .7 Revision Notes .8 Page 1 of 8 pages SMPTE 2029-2009Revision of SMPTE 2029-2007 SMPTE STANDARD Uniform Resource Names for SMPTE Resources SMPTE 2029-2009 Page 2 of 8 pages Foreword SMPTE (the Society of Motion Picture and Television Engineers) is
4、an internationally-recognized standards developing organization. Headquartered and incorporated in the United States of America, SMPTE has members in over 80 countries on six continents. SMPTEs Engineering Documents, including Standards, Recommended Practices and Engineering Guidelines, are prepared
5、 by SMPTEs Technology Committees. Participation in these Committees is open to all with a bona fide interest in their work. SMPTE cooperates closely with other standards-developing organizations, including ISO, IEC and ITU. SMPTE Engineering Documents are drafted in accordance with the rules given i
6、n Part XIII of its Administrative Practices. SMPTE 2029 was prepared by Technology Committee R30. Intellectual Property At the time of publication no notice had been received by SMPTE claiming patent rights essential to the implementation of this Standard. However, attention is drawn to the possibil
7、ity that some of the elements of this document may be the subject of patent rights. SMPTE shall not be held responsible for identifying any or all such patent rights. SMPTE 2029-2009 Page 3 of 8 pages 1 Scope This standard defines the syntax of Uniform Resource Names (URN) for SMPTE resources. These
8、 URNs are intended to provide for the assignment of unique, permanent, and location-independent names for resources that SMPTE produces and manages. 2 Conformance Notation Normative text is text that describes elements of the design that are indispensable or contains the conformance language keyword
9、s: “shall“, “should“, or “may“. Informative text is text that is potentially helpful to the user, but not indispensable, and can be removed, changed, or added editorially without affecting interoperability. Informative text does not contain any conformance keywords. All text in this document is, by
10、default, normative, except: the Introduction, any section explicitly labeled as “Informative“ or individual paragraphs that start with “Note:” The keywords “shall“ and “shall not“ indicate requirements strictly to be followed in order to conform to the document and from which no deviation is permitt
11、ed. The keywords, “should“ and “should not“ indicate that, among several possibilities, one is recommended as particularly suitable, without mentioning or excluding others; or that a certain course of action is preferred but not necessarily required; or that (in the negative form) a certain possibil
12、ity or course of action is deprecated but not prohibited. The keywords “may“ and “need not“ indicate courses of action permissible within the limits of the document. The keyword “reserved” indicates a provision that is not defined at this time, shall not be used, and may be defined in the future. Th
13、e keyword “forbidden” indicates “reserved” and in addition indicates that the provision will never be defined in the future. Unless otherwise specified the order of precedence of the types of normative information in this document shall be as follows. Normative prose shall be the authoritative defin
14、ition. Tables shall be next, followed by formal languages, then figures, and then any other language forms. 3 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indica
15、ted were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. ANSI/SMPTE 298M-1997, Television Universal Labels for Unique Identification of D
16、igital Data SMPTE 330M-2004, Television Unique Material Identifier (UMID) IETF RFC 2141, Moats, R., “URN Syntax,“ May 1997. IETF RFC 3406, Daigle, L., van Gulik, D.W., Iannella, R., Faltstrom, P. “Uniform Resource Names (URN) Namespace Definition Mechanisms,“ October 2002. IETF RFC 4234, Crocker, D.
17、, Ed. and P. Overell, “Augmented BNF for Syntax Specifications: ABNF,“ October 2005. SMPTE 2029-2009 Page 4 of 8 pages 4 Definition of Acronyms and Terms NID Namespace ID, which identifies the namespace of a URN (defined by IETF RFC 2141) NSS Namespace Specific String, which is the string after a NI
18、D and a colon in a URN (defined by IETF RFC 2141) UL Universal Label (defined by ANSI/SMPTE 298M) UMID Unique Material Identifier (defined by SMPTE 330M) URN Universal Resource Name (defined by IETF RFC 2141) 5 Uniform Resource Name General Syntax (Informative) IETF RFC 2141 defines the general synt
19、ax of URNs as: := “urn:“ “:“ SMPTE URNs use the NID “smpte”, which was defined by IETF RFC 5119 for registration in the IANA registry of URN NIDs. Requirements for NSS syntax are constrained by IETF RFC 2141. 6 SMPTE URN Namespace Policies All URNs in the SMPTE namespace shall conform to IETF RFC 34
20、06. In particular, URNs in the SMPTE namespace shall not be re-assigned, and URNs shall continue to be valid, even if the owners or registrants of the SMPTE resources identified by the URNs are no longer members or customers of SMPTE. There need not be resolution of such URNs, but they shall not res
21、olve to false or stale information. 7 Uniform Resource Names for Universal Labels 7.1 UL URN NSS The NSS of URNs for Universal Labels (ANSI/SMPTE 298M) shall begin with “ul:”. The identifier structure for the Universal Label subnamespace (UL-NSS) described using Augmented Backus-Naur Form (IETF RFC
22、4234) shall be: UL-NSS = “smpte:ul:“ UL UL = QUADBYTE *(DOT QUADBYTE) DOT = “.“ QUADBYTE = 4BYTE BYTE = 2HEXDIG SMPTE 2029-2009 Page 5 of 8 pages The hexadecimal digits in the URN representation of ULs shall be the hexadecimal representation of the UL octets. The values of “UL“ shall be constrained
23、as defined in SMPTE 298M. Lexical equivalence of UL URNs shall be determined by an exact string match that is case-insensitive for alphabetical characters. 7.2 UL URN Examples (Informative) The rules of section 5.1 result in a URN that has a defined preface of “urn:smpte:ul:“ followed by a text stri
24、ng representation of the UL that expresses the first four bytes of the UL as a hexadecimal string, followed by one or more four-byte groups of the remainder of the UL, each represented as a hexadecimal string preceded by the “.“ symbol. An example URN for a UL with three groups of four bytes is: urn
25、:smpte:ul:060a2b34.01010105.01010f20 An example URN for a UL with four groups of four bytes is: urn:smpte:ul:060e2b34.04010103.04010202.01011100 8 Uniform Resource Names for Unique Material Identifiers 8.1 UMID URN NSS The NSS of URNs for the Unique Material Identifier (SMPTE 330M) shall begin with
26、“umid:“. The identifier structure for both the basic and the extended Unique Material Identifier subnamespace (UMID-NSS) described using Augmented Backus-Naur Form (IETF RFC 4234) shall be: UMID-NSS = “smpte:umid:“ UMID UMID = QUADBYTE *(DOT QUADBYTE) DOT = ”.” QUADBYTE = 4BYTE BYTE = 2HEXDIG The he
27、xadecimal digits in the URN representation of UMIDs shall be the hexadecimal representation of the UMID octets respectively. The values of “UMID“ shall be constrained as defined in SMPTE 330M. Lexical equivalence of UMID URNs shall be determined by an exact string match that is case-insensitive for
28、alphabetical characters. Note: There are existing files that include URN UMID values that do not contain the “.“ symbol. Implementers are encouraged to accept URN UMID of this form. 8.2 UMID URN Examples (Informative) In the case of a basic UMID, the rules of section 8 result in a URN that has a def
29、ined preface of “urn:smpte:umid:“ followed by a text string representation of the UMID that expresses the 32 bytes of the UMID with the first four bytes represented as 8 hexadecimal characters, followed by four-byte groups of the remainder of the UMID, each represented as 8 hexadecimal characters pr
30、eceded by the “.“ symbol. SMPTE 2029-2009 Page 6 of 8 pages An example URN for a basic UMID is: urn:smpte:umid:060A2B34.01010105.01010D20.13000000.D2C9036C.8F195343.AB7014D2.D718BFDA or urn:smpte:umid:060a2b34.01010105.01010d20.13000000.d2c9036c.8f195343.ab7014d2.d718bfda In the case of an extended
31、UMID, the rules of section 8 result in a URN that has a defined preface of “urn:smpte:umid:“ followed by a text string representation of the UMID that expresses the 32 bytes of the basic UMID with the first four bytes represented as 8 hexadecimal characters, followed by four-byte groups of the remai
32、nder of the basic UMID, each represented as a 8 hexadecimal characters preceded by the “.“ symbol. This is followed by the “.“ symbol which is then followed by the 32 bytes of the remainder of the extended UMID with the first four bytes expressed as 8 hexadecimal characters, followed by four-byte gr
33、oups of the remainder of the extended UMID, each represented as 8 hexadecimal characters preceded by the “.“ symbol. An example URN for an extended UMID is: urn:smpte:umid:060A2B34.01010105.01010D43.33000000.8DC70900.63430597.08004602.0118276E.47E37102.63430597.00000000.00000000.00000000.4A502020.53
34、4F4E59.50445720 or urn:smpte:umid:060a2b34.01010105.01010d43.33000000.8dc70900.63430597.08004602.0118276e.47e37102.63430597.00000000.00000000.00000000.4a502020.534f4e59.50445720 SMPTE 2029-2009 Page 7 of 8 pages Annex A (Informative) Bibliography IETF RFC 1737, Sollins, K. and L. Masinter, “Function
35、al Requirements for Uniform Resource Names,“ December 1994. IETF RFC 5119, Edwards, T, “A Uniform Resource Name (URN) Namespace for the Society of Motion Picture and Television Engineers (SMPTE),” February 2008. SMPTE 2029-2009 Page 8 of 8 pages Revision Notes This revision incorporates Amendment #1
36、 to SMPTE 2029 approved February 12, 2009. The purpose of this revision is to add the NSS of URNs for Unique Material Identifier (SMPTE 330M). The changes are summarized below: 1. The Intellectual Property section has been added. 2. The following as been added to Section 3, Normative References: SMP
37、TE 330M-2004, Television Unique Material Identifier (UMID) 3. The following term has been added to Section 4, Definition of Acronyms and Terms: UMID Unique Material Identifier (defined by SMPTE 330M) 4. Section 7.1 has been amended as follows: DOT = %x2E has been replaced with DOT = ”.” 5. The following Sections have been added: 8 Uniform Resource Names for Unique Material Identifiers 8.1 UMID URN NSS 8.2 UMID URN Examples
