信息技术.多媒体内容描述接口.第12部分:查询格式

[中文适用范围]： 本部分描述了ISO/IEC 15938的其他部分可以独立使用或组合使用的查询格式工具。每个查询格式工具都在两个规范性部分中进行描述：语法（查询和管理格式的规范性规范）；语义（对相应查询格式规范中所有组件的语义的规范性定义）。在某些情况下，查询格式层级工具也使用一个或两个信息性部分进行描述：示例（可选的涉及示例的信息部分）；定义（可选的涉及定义的信息部分） [外文原描述]： ISO/IEC 15938-12:2012 describes the query format tools which may be used independently or in combination with other parts of ISO/IEC 15938. Each query format tool is described in two normative sections: a) Syntax: Normative specification of the query and management format. b) Semantic: Normative definition of the semantics of all the components of the corresponding query format specification. In some instances the query format level tool is also described using either one or two informative sections: a) Examples:Optionally, an informative section dealing with examples is appended. b) Definitions:Optionally, an informative section dealing with definitions is appended. The query format provides a standardized interface for multimedia content information retrieval systems (e.g. MPEG-7 databases) in three aspects which are input query format, output query format, and query managements. The input query format specifies the interface through which the users can describe their search criteria with a set of precise input parameters in addition to a set of preferred output parameters to depict the return result sets. The output query format specifies the interface format for the result set. The query management provides means for selecting services (e.g. MPEG-7 database) or aggregated services (e.g. service provider that administers a set of different services) based on service properties (e.g. supported query format).