I often notice that the preposition "of" followed by a linking verb.
How in this phrase for example:
The meaning is of obligation or necessity ...
Why just not to say?
The meaning is obligation or necessity ...
Another example (from gstreamer documentation) with full context would be:
So, whether playbin will use hardware acceleration or not will depend on the relative ranks of all elements capable OF dealing with that media type.
capable OF dealing with
What the preposition of means in this sentence? And in the sentence above! I suspect that the meaning is the same. But I just need the strict grammar rule for it. And may be some more examples)