How is structured data cross-checked with the page content by search engines?

Question

I've just started learning structured data and I'm still trying to wrap my head around the concept.

First I started out with Microdata using schema.org vocabulary and now I'm learning JSON-LD.

The thing that is bugging me is that 'how do search engines know that the structured data that I'm providing in the head matches with the content of the page?' because in the specific case of JSON-LD I'm not specifying which element contains what information.

This was not the case in Microdata where I provide the structured data in the element itself. And to add to my confusion I've read in multiple articles that Microdata & JSON-LD have the same result, which means my understanding of Microdata is wrong too!

Please help me with this. Thank you

Answer 1

认为JSON-LD和MicroData相互配合。页面上有很多内容的地方，请与MicroData一起使用，因为工作已经在那里。您很熟悉，因此您了解有关构造页面以使其使用的知识。 JSON-ld基本上是识别的简单捷径。 （这并不是要作为“专家”的答案，而是对仍在学习绳子的人一个简单的答案。）