本文档指定了Web API的行为，这些API以独立于底层数据存储的方式提供对数据集中功能的访问。本文档定义了发现和查询操作。 发现操作使客户端能够查询API，包括API定义和元数据 关于API提供的功能集合，以确定API的功能并检索 有关数据集可用分布的信息。 查询操作使客户端能够基于简单的 选择标准，由客户定义。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document specifies the behaviour of Web APIs that provide access to features in a dataset in a manner independent of the underlying data store. This document defines discovery and query operations. Discovery operations enable clients to interrogate the API, including the API definition and metadata about the feature collections provided by the API, to determine the capabilities of the API and retrieve information about available distributions of the dataset. Query operations enable clients to retrieve features from the underlying data store based upon simple selection criteria, defined by the client.All current amendments available at time of purchase are included with the purchase of this document.