eXist-db - adding prologue to XML file in automatic file creation?

Question

In eXist-db (4.7) I have a long TEI-XML file from which I am creating thousands of unique TEI-XML files. I am using a function like this:

let $list := doc(concat($globalvar:URIdata,"list_collections.xml"))
let $makefile := for $bib in $list//tei:bibl[@type="collection"]
                  let $newdoc := 
                            <listBibl xmlns="http://www.tei-c.org/ns/1.0" type="collection">{$bib}</listBibl>
             return xmldb:store($globalvar:URIdata, concat($bib//@xml:id,".xml"),$newdoc)
return $makefile

Everything works fine.

However, I'd like to add a prologue to the top of each new file which points to my custom TEI schema:

<?xml-model href="../dictionaries/tei_thema.rng" 
            type="application/xml" 
            schematypens="http://relaxng.org/ns/structure/1.0"?>

Is there a way to do this within the function above? If not, is there a secondary process I can create to insert this at the top of the new file?

Many thanks in advance.

Answer 1

To construct a new document explicitly use document { } e.g. in your case

let $newdoc := document { <?xml-model href="../dictionaries/tei_thema.rng" type="application/xml" schematypens="http://relaxng.org/ns/structure/1.0"?>, <listBibl xmlns="http://www.tei-c.org/ns/1.0" type="collection">{$bib}</listBibl> }