LibreOffice
LibreOffice 6.2 SDK API Reference
LibreOffice Documentation

This is a reference documentation for the UNO IDL API.

Remarks
UNO IDL has no concept of "public" or "protected". "Protected Member" or "Protected Attribute" in the context of this IDL documentation actually means "members inherited from optional service or interface", i.e., not every implementation supports these members or attributes.