Issues with XML and Semantic Web ?

Hi All,

I apologize if this is not the target audience for this query. But if
any of you feel that this is a question that is worth answering, do
take a peek.
I was running this long philosophical thought on the future of the
Semantic Web and all the excitement that surrounds it. Between all
this excitement, well, I just had a few questions on the following.
1) What are the significant open issues with the Semantic Web ?
2) Is the choice of XML as the syntactic representation of the data
model a long term "right option" ?
3) Your thoughts on the Complexity of the current ontology expression
languages like OWL, DAML+OIL etc.
4) Your thoughts on the adaptability curve for the Ontologies across
Enterprises for the next couple of years and beyond.

Your thoughts are valuable . Dont keep it with you !!!!!

Thanks!

Gar.