本文件支持以下定义: -？离散全球电网系统（DGGS）核心包括: -？使用具有结构化几何结构的分区标识符的RS，以及 -？提供导入、导出和拓扑查询功能， -？基于ISO？19111 CRS，使用分区标识符、分区标识符和分区的几何、拓扑、RS的通用时空类。时空范围被限制为: -？始终不变的空间元素，以及 -？跨所有空间不变的时间元素。 -？等面积地球DGG的等面积地球参考系统（EAERSs）。

This document supports the definition of: —？A Discrete Global Grid Systems (DGGS) core comprising: —？an RS using zonal identifiers with structured geometry, and —？functions providing import, export and topological query, —？Common spatio-temporal classes for geometry, topology, RS using zonal identifiers, zonal identifiers and zones, based on ISO？19111 CRS. The spatio-temporal scope is constrained to: —？spatial elements that are invariant through all time, and —？temporal elements that are invariant across all space. —？Equal-Area Earth Reference Systems (EAERSs) for Equal-Area Earth DGGS.