Hello,
I'm using Java org.xmldb.api package for accessing the Basex server (xmldb:basex://...)
After getting the resultSet I need to make further queries about the requested subset (for reporting, etc.)
I have seen that getId() cannot be used since the Resource will be anonymous if it is obtained as the result of a query.
Source: http://xmldb-org.sourceforge.net/xapi/api/index.html

The queries are not fixed and are based on end user selection.
I couldn't find a way to have a direct access/reference to a document. In my case the ID is simply the filename, but it doesn't seem to be so efficient.
I wonder if creating a temporal collection for the subset would be faster than making query/queries similar to the following example in which there are only two ids, but I can have thousands of them:

let $ids := ('360836','300139')
for $x in collection("collection_name")
let $filename := substring-after(base-uri($x),'/')
let $id := substring-before($filename,'.')
where $id = $ids
return ...

-- 
With kind regards,
Menashè