地理信息. 地理标记语言 (GML). 第2部分: 扩展模式和编码规则

[中文适用范围]： 地理标记语言（GML）是一种符合 ISO 19118 的 XML 编码，用于传输和存储按照 ISO 19100 系列国际标准中所使用的概念建模框架建模的地理信息，包括地理要素的空间和非空间属性。ISO 19136 的此部分定义了 XML 模式语法、机制和约定，其：——为以 XML 格式传输和存储地理信息的地理空间应用模式描述提供开放的、与供应商无关的框架；——允许使用支持 GML 框架描述能力的适当子集的配置文件；——支持为专门领域和信息社区描述地理空间应用模式；——支持创建和维护链接的地理应用模式和数据集；——支持应用模式和数据集的存储和传输；——提高组织共享地理应用模式及其描述信息的能力。实施者可能决定将地理应用模式和信息存储在 GML 中，或者他们可能决定根据需要从其他存储格式转换并仅使用 GML 进行模式和数据传输。 [外文原描述]： The Geography Markup Language (GML) is an XML encoding in compliance with ISO 19118 for the transport and storage of geographic information modelled in accordance with the conceptual modelling framework used in the ISO 19100‑ series of International Standards and including both the spatial and non-spatial properties of geographic features. ISO 19136-2:2015 defines the XML Schema syntax, mechanisms and conventions that: ? provide an open, vendor-neutral framework for the description of geospatial application schemas for the transport and storage of geographic information in XML; ? allow profiles that support proper subsets of GML framework descriptive capabilities; ? support the description of geospatial application schemas for specialized domains and information communities; ? enable the creation and maintenance of linked geographic application schemas and datasets; ? support the storage and transport of application schemas and datasets; ? increase the ability of organizations to share geographic application schemas and the information they describe. Implementers may decide to store geographic application schemas and information in GML, or they may decide to convert from some other storage format on demand and use GML only for schema and data transport. ISO 19136-2:2015 builds on ISO 19136:2007 (GML 3.2), and extends it with additional schema components and requirements. NOTE If an ISO 19109 conformant application schema described in UML is used as the basis for the storage and transportation of geographic information, this part of ISO 19136 provides normative rules for the mapping of such an application schema to a GML application schema in XML Schema and, as such, to an XML encoding for data with a logical structure in accordance with the ISO 19109 conformant application schema.