地理标记语言（GML）是一种符合ISO 19118的XML编码，用于根据ISO 19100系列国际标准中使用的概念建模框架建模的地理信息的传输和存储，包括地理特征的空间和非空间属性。本文档定义了以下XML模式语法、机制和约定:-提供一个开放的、与供应商无关的框架，用于描述地理空间应用程序架构，以XML形式传输和存储地理信息；-允许支持GML框架描述能力的适当子集的配置文件；-支持对专业领域和信息社区的地理空间应用模式的描述；-支持创建和维护链接的地理应用程序架构和数据集；-支持应用架构和数据集的存储和传输；-提高组织共享地理应用程序架构及其描述的信息。实现者可以决定将地理应用程序模式和信息存储在GML中，也可以决定根据需要从其他存储格式转换，并仅将GML用于模式和数据传输。注意:如果使用UML中描述的符合ISO 19109的应用程序模式作为地理信息存储和传输的基础，则本文档提供了将此类应用程序模式映射到XML模式中的GML应用程序模式的规范规则，因此，根据符合ISO 19109的应用程序模式，对具有逻辑结构的数据进行XML编码。

The Geography Markup Language (GML) is an XML encoding in accordance 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. This document 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 can decide to store geographic application schemas and information in GML, or they can decide to convert from some other storage format on demand and use GML only for schema and data transport. 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 document 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.