I have a RESTXQ path/function that is supposed to retrieve a document
fragment, restricted to an XPath expression that is given as a query
parameter, i.e., as a string. The list of possible fragment XPaths has
been calculated using path() by another function, and the user of a Web
application may choose to retrieve any of the fragments.
An example for such a path would be
'/Q{http://www.tei-c.org/ns/1.0}TEI[1]/Q{http://www.tei-c.org/ns/1.0}text[1]/Q{http://www.tei-c.org/ns/1.0}front[1]/Q{http://www.tei-c.org/ns/1.0}div[3]'.
Is there a better solution than the following, whose performance is of
course quite poor (around 2 seconds execution time for the given
documents)? I’m thinking of something like saxon:evaluate() or the XSLT
3 instruction xsl:evaluate.
Maybe I’m just unaware of the obvious solution based upon XQuery 3 or a
BaseX extension.
Gerrit
declare
%rest:path("/content/fragment/{$db}/{$doc}")
%rest:query-param("xpath", "{$xpath}")
%rest:GET
function page:get-frags(
$db as xs:string,
$doc as xs:string,
$xpath as xs:string
)
as item()*
{
<response>
{ for $doc in db:open($db, $doc)
return $doc//*[path(.) eq $xpath] }
</response>
};
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