RDF refers to the Resource Description Framework (but it is always called by its acronym). It was originally developed for representation of Metadata (i.e data about resources e.g. in Dublin Core), and is widely used that way. But it is now designed for representing data itself, i.e, as a general data model. 它最初是为元数据(即关于资源的数据，如都柏林核心)的表示而开发的，并以这种方式被广泛使用。但是现在它被设计用于表示数据本身，即作为一个通用的数据模型。According to the standard, it must be encoded in XML (as “RDF/XML”), but other serialisations are much more popular, including “Turtle” and “JSON-LD” which is a JSON encoding.
    RDFS refers to the _Resource Description Framework Schema. _RDFS is both a name-space and some formal modelling primitives and semantics that extend the descriptive power of RDF.

    RDFS提到了资源描述框架模式。RDFS既是一个名称空间，也是一些扩展RDF描述能力的形式化建模原语和语义。