Hello,
is there a list of which attributes (BCL, Aurelius, Json, XData) there are and what they mean?
There is not a list of all unrelated attributes available. They are grouped by their use, because they have very distinct use cases.
But in the documentation, they are presented in their own sections. For example (not a comprehensive list):
Attributes for mapping Aurelius entity classes: Mapping | TMS Aurelius documentation
Attributes for data validation: Data Validation | TMS Aurelius documentation
Attribute for defining global filters: Global Filters | TMS Aurelius documentation
Attributes for defining event handlers: Events | TMS Aurelius documentation
Attributes for defining XData endpoints (service contracts): Service Operations | TMS XData documentation
Attributes for protecting and authorizing XData endpoints: Authentication and Authorization | TMS XData documentation
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Bookmarked that list 
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