This will pull the identifiers and partners from EADs containing a dao (i.e. allowing a count of finding aids that link to digital material)

daosFromEad

<data>
{
for $Record in /ead[archdesc/dsc/descendant::dao]
let $id := $Record/archdesc/did/unitid
let $repo := $Record/archdesc/did/repository
let $address := $Record/eadheader/filedesc/publicationstmt/address/addressline[1]



return

<record>
 <id>{$id}</id>
 <repo>{data($repo)}</repo>
 <address>{data($address)}</address>
</record>

}
</data>