Thisistheideaofwhatwehadtalkedabout.这里of后面的句子做什么成分?是作idea的宾语补足语吗?of后一般接什么成分?

Question

This is the idea of what we had talked about.这里of后面的句子做什么成分?
是作idea的宾语补足语吗?of后一般接什么成分?

Answer 1

This is the idea of what we had talked about.
of what we had talked about 和idea是同位语.