xpath - XProc - How to repeat a subpipeline for a specific number of times -

i'd repeat xproc subpipeline given number of times. (in usecase subpipeline consists of exec-step, runs latex on created .tex-file)

a simplified version of code looks following, gives no result far:

<p:declare-step  version="1.0" xmlns:p="http://www.w3.org/ns/xproc" xmlns:c="http://www.w3.org/ns/xproc-step">  <p:option name="latex-exec" select="'uri/latex'"/> <p:option name="latex-repeat" select="3"/> <p:option name="tmp-path" select="'uri/tmp/'"/> <p:option name="tmp-file" select="'tmp'"/>  <!-- pre-processing -->  <p:for-each>     <p:iteration-source select="(1 $latex-repeat)"/>      <p:exec result-is-xml="false">         <p:with-option name="command" select="$latex-exec"/>         <p:with-option name="args"    select="string-join(('-interaction=nonstopmode','-halt-on-error','-output-format=pdf',concat('-output-directory=',$tmp-path),concat($tmp-path,$tmp-file,'.tex')),' ')"/>         <p:input port="source">             <p:empty/>         </p:input>     </p:exec> </p:for-each> 

i don't know if issue xpath-2.0 expression in p:iteration-source element. however, following works , gives correct result "message: 3":

<cx:message>     <p:with-option name="message" select="count((1 $latex-repeat))"/>     <p:input port="source">         <p:empty/>     </p:input> </cx:message> 

my exec-step tested outside for-each loop , works. working calabash under oxygen 16.0.

the problem approach can iterate on xml documents in xproc 1.0. since select expression in p:iteration-source produces sequence of numbers, not documents, pipeline fail dynamic error (most err:xd0001: dynamic error if non-xml resource produced on step output or arrives on step input.)

(the reason why example cx:message works p:with-option construct binds value option , result of select xpath expression treated xs:untypedatomic.)

to loop n number of times, have use recursion, in following example (untested should idea):

<p:declare-step version="1.0"                 xmlns:p="http://www.w3.org/ns/xproc"                 xmlns:c="http://www.w3.org/ns/xproc-step"                 xmlns:my="http://example.org/latex-process"                 type="my:latex-process">    <p:option name="latex-exec" select="'uri/latex'"/>   <p:option name="latex-repeat" select="3"/>   <p:option name="tmp-path" select="'uri/tmp/'"/>   <p:option name="tmp-file" select="'tmp'"/>    <p:choose>     <p:when test="$latex-repeat = 0">       <p:sink>         <p:input port="source">           <p:empty/>         </p:input>       </p:sink>     </p:when>     <p:otherwise>       <p:exec result-is-xml="false">         <p:with-option name="command" select="$latex-exec"/>         <p:with-option name="args"    select="string-join(('-interaction=nonstopmode','-halt-on-error','-output-format=pdf',concat('-output-directory=',$tmp-path),concat($tmp-path,$tmp-file,'.tex')),' ')"/>         <p:input port="source">           <p:empty/>         </p:input>       </p:exec>       <my:latex-exec>         <p:with-option name="latex-exec" select="$latex-exec"/>         <p:with-option name="latex-repeat" select="$latex-repeat - 1"/>         <p:with-option name="tmp-path" select="$tmp-path"/>         <p:with-option name="tmp-file" select="$tmp-file"/>       </my:latex-exec>     </p:otherwise>   </p:choose> </p:declare-step>