Did you see my other suggestion in the first answer to try to change your XQuery code to use
insert node $record/c ! element { node-name() } { @*, node() } into db:open('uk_parlement_ead')/dsc
Oh, i missed it ! Sorry.
It is working ... at the <c> level :
<c level="item">
<did xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:marc="http://www.loc.gov/MARC21/slim">
I see, I guess one way would be to write a recursive function you pass that `c` element to that then recreates any element like in the above snippet, only recursively e.g.
};
and then use e.g.
insert node $record/c ! local:strip-namespaces(.) into db:open('uk_parlement_ead')/dsc
Hopefully there is an easier way using XQuery update instructions
but I am not good enough with them to know.