Friday, June 29, 2018
n 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).
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