What's the deal with “data:post.url”, “data:post.title”, etc

Question

Would someone be so kind as to explain what this data object is (if it is an object) and if there is any documentation on it.

I was adding social sharing buttons to

Answer 1

In this case, data: is a namespace that scopes the data available from Blogger that can be included in a template. The authoritative list of what's availabe is here.

It is Blogger-centric.

The other namespaces are b: which deals with layout and control flow, and expr: which keys the engine into the fact that the tags involve data from Blogger (as you have above).

A good tutorial is here.