a question about multi-ontologies

Hi all,
   Some ontologies are good, some ontologies are not good, some
ontologies are bad. I can build an ontology, someone else can build an
ontology too in the same domain and same vocabularies as mine, but the
definitions are different. How could the Semantic Web or agent handle
these different ontologies? Using different signature digital? Every
ontologies can exist at the same time but won't influence each other?
Thanks in advance!
 
 
Best regards,
Zhu, Bin
 
http://www.uclab.org/zhubin/
 
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Ubiquitous Computing Lab (http://www.uclab.org)