CEA-2018-2007.pdf
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1、 CEA Standard Task Model Description CE Task 1.0 CEA-2018 November 2007 Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 12/17/2007 18:48:30 MSTNo reproduction or networking permitted without license
2、from IHS -,-,- NOTICE Consumer Electronics Association (CEA) Standards, Bulletins and other technical publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and as
3、sisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards, Bulletins and other technical publications shall not in any respect preclude any member or nonmember of CEA from manufacturing or selling products not conformi
4、ng to such Standards, Bulletins or other technical publications, nor shall the existence of such Standards, Bulletins and other technical publications preclude their voluntary use by those other than CEA members, whether the standard is to be used either domestically or internationally. Standards, B
5、ulletins and other technical publications are adopted by CEA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, CEA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard, Bulletin
6、 or other technical publication. This CEA Standard is considered to have International Standardization implication, but the International Electrotechnical Commission activity has not progressed to the point where a valid comparison between the CEA Standard and the IEC document can be made. This Stan
7、dard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its u
8、se. (Formulated under the cognizance of the CEAs R7 Home Network Committee.) Published by CONSUMER ELECTRONICS ASSOCIATION 2007 Technology Phone 800-854-7179; Fax 303-397-2740; Internet http:/; E-mail DCMI Documents: Dublin Core Metadata Initiative (DCMI); Internet http:/www.dublincore.org ECMA Doc
9、uments: ECMA International, Rue du Rhone 114, CH-1204 Geneva; Phone +41 22 849 6000; Fax +41 22 489 6001; Internet http:/www.ecma-international.org/. ECMA Standard Documents can be downloaded electronically and free of charge at http:/www.ecma- international.org/publications/standards/Standard.htm C
10、opyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 12/17/2007 18:48:30 MSTNo reproduction or networking permitted without license from IHS -,-,- CEA-2018 4 IETF Documents: Internet Engineering Task Force
11、 (IETF) Secretariat, c/o Corporation for National Research Initiatives, 1895 Preston White Drive, Suite 100, Reston, VA 20191-5434, USA; Phone 703- 620-8990; Fax 703- 620-9071; Internet www.ietf.org, IETF RFCs may be downloaded from www.ietf.org/rfc.html, IETF Internet drafts may be downloaded from
12、www.ietf.org/ID.html ISO/IEC Documents: International Organization for Standardization (ISO); ISO Central Secretariat; 1, rue de Varemb; Case postale 56; CH-1211 Geneva 20; Switzerland; Telephone +41 22 749 01 11; Fax +41 22 733 34 30; Internet http:/www.iso.org/; ISO/IEC Standard Documents can be p
13、urchased and downloaded electronically at http:/www.iso.org/iso/en/prods-services/ISOstore/store.html UPnP Documents: UPnP Forum; Internet http:/www.upnp.org/ World Wide Web Consortium Documents: World Wide Web Consortium (W3C); Internet http:/www.w3.org/ 4 TERM USAGE Notwithstanding the placement o
14、f a NOTE or EXAMPLE in a normative section, paragraphs marked as “NOTE” or “EXAMPLE” shall be treated as informative. 4.1 Applications DEFINITION 1 A task-based application (“application” for short) is a program that interprets task model descriptions according to the semantics defined in this stand
15、ard. For brevity, in the remainder of this document, a task-based application will be referred to generically as an application. 4.2 Use of Shall, Should and May Specific keywords are used in this document to differentiate levels of requirements and optionality, as follows: Shall: Indicates a mandat
16、ory requirement. Designers are required to implement all such mandatory requirements to assure interoperability with other products conforming to this standard. Should: Indicates flexibility of choice with a strongly preferred alternative. Equivalent to the phrase “is recommended.” May: Indicates fl
17、exibility of choice with no implied preference. 4.3 Schemas The valid syntax for task model descriptions is defined using RelaxNG 6, with comments added to express restrictions that are not expressible in this schema language. These schemas are presented in Table 1 through Table 7 and are normative
18、in this standard. The syntax for the about document (see 10.2.3) is also defined using RelaxNG. The corresponding Table 9 is normative in this standard. Notice that the order of XML sibling elements is fixed throughout the syntax schemas (attributes may be provided in any order). The motivation for
19、this approach is to make it easier for humans to read task model descriptions and for applications to process them. Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 12/17/2007 18:48:30 MSTNo reproduct
20、ion or networking permitted without license from IHS -,-,- CEA-2018 5 4.4 Namespaces This standard defines and uses the XML namespaces “http:/ce.org/cea-2018“ for task model descriptions. Examples in this standard assume that this namespace is declared as the default namespace on the root element of
21、 a task model description document, such as in the following: Task model descriptions may adopt this approach, or define an explicit namespace prefix. For other namespaces, the following three prefixes are used in the examples throughout this standard. Task model descriptions are not required to use
22、 these same prefixes as long as they declare the relevant namespaces properly (as specified in 7). xsd - the namespace http:/www.w3.org/2001/XMLSchema (XML Schema Definition) dc - the namespace http:/purl.org/dc/elements/1.1 (DCMI Element Set). A schema definition file for this namespace is availabl
23、e at http:/www.dublincore.org/schemas/xmls/qdc/2006/01/06/dc.xsd dcterms - the namespace http:/purl.org/dc/terms (DCMI Metadata Terms). A schema definition file for this namespace is available at http:/www.dublincore.org/schemas/xmls/qdc/2006/01/06/dcterms.xsd Namespace URIs, such as those above, ar
24、e primarily for identification purposes and are not required to be resolvable 7, i.e., they might not serve a document when used as an internet address. 4.5 Classes and Instances The standard terminology of object-oriented programming and design is used in this document without formal definition. In
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