Hi Gerrit,
you are probably looking for the xquery:eval function [1]:
xquery:eval( "db:open('" || $db || "', '" || $doc || "')" || $xpath)
You
can make the query string safer by
bind
ing
variables to
the evaluated expression:
xquery:eval( "db:open($db, $doc)" || $xpath,
map { "db" := $db, "doc" = $doc })
Hope this helps,
Christian
[1] http://docs.basex.org/wiki/XQuery_Module
___________________________
On Mon, Nov 11, 2013 at 12:44 PM, Imsieke, Gerrit, le-tex <
gerrit.imsi...@le-tex.de> wrote:
> I have a RESTXQ path/function that is supposed to retrieve a document
> fragment, restricted to an XPath expression that is given as a query
> parameter, i.e., as a string. The list of possible fragment XPaths has
been
> calculated using path() by another function, and the user of a Web
> application may choose to retrieve any of the fragments.
>
> An example for such a path would be
> '/Q{
http://www.tei-c.org/ns/1.0}TEI[1]/Q{http://www.tei-c.org/ns/1.0}text[1]/Q{http://www.tei-c.org/ns/1.0}front[1]/Q{http://www.tei-c.org/ns/1.0}div[3]
'.
>
> Is there a better solution than the following, whose performance is of
> course quite poor (around 2 seconds execution time for the given
documents)?
> I’m thinking of something like saxon:evaluate() or the XSLT 3 instruction
> xsl:evaluate.
>
> Maybe I’m just unaware of the obvious solution based upon XQuery 3 or a
> BaseX extension.
>
> Gerrit
>
> declare
> %rest:path("/content/fragment/{$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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