Thanks for the answer,

before I continue, you should know that I have just started to work with 
these concepts so there could be really easy answers, as I haven't 
necessarily yet understood the whole concept.

So concerning "DC.identifier" I should just make an assumption that it 
searches in some of the server indexes (chosen by us) and there doesn't 
have to be any descriptions, at least none standardized description of 
this assumption?

I have been told to use the XML below, but isn't this wrong as it says 
that "DC.identifier" is the same as ISBN and ISSN, and those are actually 
completely different indexes?
Or does it say that searching for DC.identifier the access point is both 
ISBN and ISSN?

I'm probably thinking too mathematical....

  Regards RogerW.


<index id="7">
  <title>isbn</title> 
  <map>
    <name>isbn</name> 
  </map>
  <map>
    <name set="bath">isbn</name> 
  </map>
  <map>
    <name set="DC">identifier</name> 
  </map>
</index>
<index id="8">
  <title>issn</title> 
  <map>
    <name>issn</name> 
  </map>
  <map>
    <name set="bath">issn</name> 
  </map>
  <map>
    <name set="DC">identifier</name> 
  </map>
</index>