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Schema.org is defined as two hierarchies: one for textual property values, and one for the things that they describe. This document presents the main type hierarchy, a collection of types (or "classes") each with one or more parent types, shown in a tree structure. (Schema.org 被定义为两个层次结构：一个用于文本属性值，另一个用于它们所描述的事物。本文档展示了主要的类型层次结构，这是一个类型（或“类”）的集合，每个类型都有一个或多个父类型，并以树状结构呈现。)