One key difference between the message form and the plain form is that RDF: about is used to identify the issue resource, however, it is not declared in-line using an id.

消息形式和一般形式的一个关键的区别是，rdf：about用来识别问题资源，但是，它没有内联地使用标识来声明。

youdao

One key difference between the message form and the plain form is that RDF: about is used to identify the issue resource, however, it is not declared in-line using an id.

消息形式和一般形式的一个关键的区别是，rdf：about用来识别问题资源，但是，它没有内联地使用标识来声明。

youdao