XML prefix declaration

[ktk]

I have an XML file that looks similar to example8 but with one difference: The initial element is already using a namespace, here iweb_authorities:

<?xml version="1.0" encoding="UTF-8"?>
<iweb_authorities:authoritiesMessage xmlns:iweb_authorities="http://www.i-web.ch/schema/IwebAuthorities/1" xmlns:iweb_general="http://www.i-web.ch/schema/IwebGeneral/1" xmlns:iweb_ris_general="http://www.i-web.ch/schema/IwebRISGeneral/1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:eCH-0007="http://www.ech.ch/xmlns/eCH-0007/6" xsi:schemaLocation="http://www.i-web.ch/schema/IwebAuthorities/1 http://www.i-web.ch/schema/IwebAuthorities/1/IwebAuthorities.xsd http://www.i-web.ch/schema/IwebGeneral/1 http://www.i-web.ch/schema/IwebGeneral/1/IwebGeneral.xsd http://www.i-web.ch/schema/IwebRISGeneral/1 http://www.i-web.ch/schema/IwebRISGeneral/1/IwebRISGeneral.xsd http://www.ech.ch/xmlns/eCH-0007/6 http://www.ech.ch/xmlns/eCH-0007/6/eCH-0007-6-0.xsd">
  <iweb_authorities:header>
    <iweb_general:messageId>65653265</iweb_general:messageId>
    <iweb_general:senderId>i-web</iweb_general:senderId>
    <iweb_general:sendDate>2016-04-15T08:00:03</iweb_general:sendDate>
    <iweb_general:sendingApplication>icms</iweb_general:sendingApplication>
    <iweb_general:receiverId>lindas</iweb_general:receiverId>
    <iweb_general:receivingApplication>behoerdenverzeichnis</iweb_general:receivingApplication>
  </iweb_authorities:header>
  <iweb_authorities:authority>
    <iweb_authorities:metaData>
      <iweb_general:objectId>6746</iweb_general:objectId>
      <iweb_general:validFrom>0001-01-01T00:00:00</iweb_general:validFrom>
      <iweb_general:validUntil>9999-12-31T23:59:59</iweb_general:validUntil>
      <iweb_general:URL>http://www.gemeinde-riederalp.ch/de/politik/behoerden/</iweb_general:URL>
    </iweb_authorities:metaData>

My mapping starts like this:

<#Authority>
  rml:logicalSource [
    rml:source "input/riederalp/riederalp_behoerden.xml";
    rml:referenceFormulation ql:XPath;
    rml:iterator "/iweb_authorities:authoritiesMessage/iweb_authorities:authority"
  ]; 

but that fails as it doesn't seem to recognize the first iweb_authorities prefix:

663 [main] ERROR be.ugent.mmlab.rml.processor.concrete.XPathProcessor  - XPathException javax.xml.xpath.XPathException: javax.xml.xpath.XPathException: nu.xom.XPathException: XPath error: XPath expression uses unbound namespace prefix iweb_authorities for the expression /iweb_authorities:authoritiesMessage/iweb_authorities:authority

I tested the XPath expression in Eclipse where it works fine, it figures out the prefixes on its own as defined in the prefixed element itself in the XML.

Any ideas on how this should be specified in RML?

[ktk]

FYI I tested with example8 and that doesn't seem to work either with latest release of RML-Mapper:

665 [main] ERROR be.ugent.mmlab.rml.processor.concrete.XPathProcessor  - XPath Exception: javax.xml.xpath.XPathException: javax.xml.xpath.XPathException: org.xml.sax.SAXParseException; systemId: file:///Users/ktk/workspace/zazuko/seco/usecases/i-web/input/simergy.xml; lineNumber: 10; columnNumber: 80; The prefix "simmodel" for element "simmodel:SimAppLibraryDefault_AppLibraryDefault_GlobalLibrary" is not bound.

[syats]

HI @ktk
I have been running into the same issues. Apparently namespaces and XPath is a complicated issue.
I wonder if you got around this in any way? I've even tried the competing RML implementation with the same results.
Any pointers would be appreciated.

[ktk]

@syats long time ago, to be honest I don't use RML anymore, codebase is too buggy and everyone I talked to with some Java clue told this is not code they want to touch. So not sure if there is a solution to that.

[florent-andre]

As of RMLio/rmlmapper-java#132, this issue should be closed.