xsd file in the xml instance file

Hi Everyone,

Sorry if my questions are on the wrong mailing-list(s) but in case you can 
answer these: 

 - can an XML instance document contain the validation xsd file in itself 
and not just an xsi:schemaLocation reference?
- can the schemaLocation property be any path (absolute and relative), 
too?

The problem is that there is an xml file which is being modified and saved 
again and again, and sometimes it is saved into another directory and this 
time the relative schemaLocation reference becomes unavailable...(I mean 
the xsd file gets unavailable from the referencing instance document...)
 

Many thanks to You in advance,

Kind regards,

Csaba Szucs