[question] about annotea

I want to construct ontology on annotea server and annotate document or html to metadata using this ontology and annotea client tool(ex: amaya). Or, Can I define or modify ontology using amaya? 

When I used amaya on default setting, annotated just tile, author, etc. (maybe..this ontology define w3c.org or default local host)

I don't know how I can construct ontology on annotea server or amaya. 

I want to know how I can modify or define ontology.