Oups indeed, thank you! On Fri, Jan 31, 2014 at 10:41 AM, Hermann Stamm-Wilbrandt <[email protected]> wrote: > Thanks William! > That does not return what was requested, but changing "pre" to "urn:u" two > times does: > http://try.zorba.io/queries/xquery/BwMzU0SPVdY9X7f5DO42g15Gt94%3D > > > Mit besten Gruessen / Best wishes, > > Hermann Stamm-Wilbrandt > Level 3 support for XML Compiler team and Fixpack team lead > WebSphere DataPower SOA Appliances > https://www.ibm.com/developerworks/mydeveloperworks/blogs/HermannSW/ > https://twitter.com/HermannSW/ > http://stamm-wilbrandt.de/GraphvizFiddle/ > ---------------------------------------------------------------------- > IBM Deutschland Research & Development GmbH > Vorsitzende des Aufsichtsrats: Martina Koederitz > Geschaeftsfuehrung: Dirk Wittkopp > Sitz der Gesellschaft: Boeblingen > Registergericht: Amtsgericht Stuttgart, HRB 243294 > > > > From: William Candillon <[email protected]> > > To: Michael Kay <[email protected]>, > > Cc: Hermann Stamm-Wilbrandt/Germany/IBM@IBMDE, "[email protected] > Talk" <[email protected]> > > Date: 01/31/2014 10:17 AM > > Subject: Re: [xquery-talk] Q: computed element and namespace > > > > > > > In XQuery 3.0 you could write the following: > element {"a"}{ > ( > namespace pre { "urn:u" }, > element {fn:QName("pre", "pre:b")}{}, > element {fn:QName("pre", "pre:c")}{} > ) > } > http://try.zorba.io/queries/xquery/OEkkPFKllu7moQ5l6eCBTQ1fiBY%3D > > On Fri, Jan 31, 2014 at 9:51 AM, Michael Kay <[email protected]> wrote: >> >> On 31 Jan 2014, at 08:12, Hermann Stamm-Wilbrandt <[email protected]> > wrote: >> >>> >>> From (1): >>> In XPath Version 2.0, the namespace axis is deprecated and need not be >>> supported by a host language. A host language that does not support the >>> namespace axis need not represent namespace bindings in the form of > nodes. >>> >>> XQuery (eg. Zorba or DataPower) does not support the namespace axis. >>> >>> >>> <a><pre:b xmlns:pre="urn:u"/><pre:c xmlns:pre="urn:u"/></a> >>> >>> can be created by computed element constructors (2) by this: >>> >>> element {"a"}{ >>> ( >>> element {fn:QName("urn:u", "pre:b")}{}, >>> element {fn:QName("urn:u", "pre:c")}{} >>> ) >>> } >>> >>> Is it true, that "equivalent" (not sure whether right term) XML >>> <a xmlns:pre="urn:u"><pre:b/><pre:c/></a> >>> >>> cannot be created by computed element constructors in XQuery? >> >> If we're talking about XQuery 1.0, then yes, I believe that there is no > way you can create an element with a namespace that is (a) unused on that > element, and (b) not known statically. >> >> (I might be wrong; I seem to recall David Carlisle coming up with a > devious workaround, but it was so devious I don't recall how it works). >> >> Query 3.0 introduces dynamic namespace node constructors to solve this > problem. This leaves the language in the rather absurd situation that there > is a construct to create namespace nodes, but no construct to retrieve > them. >> >> The XQuery WG was very reluctant to support the namespace axis because > many vendors claimed that it was impossible to support it efficiently. Some > of those vendors, when told to look at open source implementations like xt > and Saxon that had efficient implementations, said that their company > policy did not allow them to read open source code. Shame. >> >> Michael Kay >> Saxonica >> >>> >>> >>> It can be created by XSLT 1.0+EXSLT stylesheet: >>> >>> $ java -jar ~/Desktop/saxon6-5-5/saxon.jar dummy.xml compel.xsl ; echo >>> <a xmlns:pre="urn:u"><pre:b/><pre:c/></a> >>> $ >>> $ cat compel.xsl >>> <xsl:stylesheet version="1.0" >>> xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; >>> xmlns:exslt = "http://exslt.org/common"; >>>> >>> <xsl:output omit-xml-declaration="yes" /> >>> >>> <xsl:template match="/"> >>> <xsl:variable name="tmp"> >>> <xsl:element name="a"> >>> <xsl:attribute name="pre:ʎɯɯnp" xmlns:pre="urn:u"/> >>> <xsl:element name="pre:b" xmlns:pre="urn:u"/> >>> <xsl:element name="pre:c" xmlns:pre="urn:u"/> >>> </xsl:element> >>> </xsl:variable> >>> >>> <xsl:apply-templates select="exslt:node-set($tmp)/*"/> >>> </xsl:template> >>> >>> <xsl:template match="*"> >>> <xsl:copy> >>> <xsl:copy-of select="namespace::*|attribute::*[local-name >>> ()!='ʎɯɯnp']"/> >>> <xsl:apply-templates select="*"/> >>> </xsl:copy> >>> </xsl:template> >>> >>> </xsl:stylesheet> >>> $ >>> >>> >>> (1) http://www.w3.org/TR/xpath20/#dt-in-scope-namespaces >>> (2) http://www.w3.org/TR/xquery/#id-computedElements >>> >>> Mit besten Gruessen / Best wishes, >>> >>> Hermann Stamm-Wilbrandt >>> Level 3 support for XML Compiler team and Fixpack team lead >>> WebSphere DataPower SOA Appliances >>> https://www.ibm.com/developerworks/mydeveloperworks/blogs/HermannSW/ >>> https://twitter.com/HermannSW/ >>> http://stamm-wilbrandt.de/GraphvizFiddle/ >>> ---------------------------------------------------------------------- >>> IBM Deutschland Research & Development GmbH >>> Vorsitzende des Aufsichtsrats: Martina Koederitz >>> Geschaeftsfuehrung: Dirk Wittkopp >>> Sitz der Gesellschaft: Boeblingen >>> Registergericht: Amtsgericht Stuttgart, HRB 243294 >>> >>> _______________________________________________ >>> [email protected] >>> http://x-query.com/mailman/listinfo/talk >> >> >> _______________________________________________ >> [email protected] >> http://x-query.com/mailman/listinfo/talk > >
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