Patrick Hochstenbach

NAME

Catmandu::Fix::xpath_map - map values from a XML::LibXML::Element value to a field

SYNOPSIS

   #   <mets:dmdSec ID="dmd1">
   #    <mets:mdWrap MDTYPE="MODS">
   #     <mets:xmlData>
   #      <mods:mods xmlns:mods="http://www.loc.gov/mods/v3" ID="mods1" version="3.4">
   #        <mods:titleInfo>
   #         <mods:title>Alabama blues</mods:title>
   #        </mods:titleInfo>
   #      </mods:mods>
   #     </mets:xmlData>
   #    </mets:mdWrap>
   #   </mets:dmdSec>

   # The dmdSec.0.mdWrap.xmlData contains a XML::LibXML::Element
   # Map the value of the 'mods:titleInfo/mods:title' XPath to
   # a new field 'my_new_field'.
   # Optionally provide one or more namespace mappings to use
   xpath_map(
       dmdSec.0.mdWrap.xmlData,
       'mods:titleInfo/mods:title',
       my_new_field,
       -mods:'http://www.loc.gov/mods/v3'
   )

   # Result:
   #
   # 'my_new_field' => 'Alabama blues'

DESCRIPTION

Not all XML fields in an XML Schema can be mapped to a Perl Hash using Catmandu::XSD. Especially <any> fields in a schema, which can contain any type of XML are problematic. These fields are mapped into a blessed XML::LibXML::Element object. Using the xpath_map Fix, on can access these blessed objects and extract data from it using XPaths.

METHOD

xpath_map(xml_field, xpath, new_field [, namespace-prefix:namespace-url [,...]])

Map an XML field at xml_field to new_field using an XPath expresssion xpath.

SEE ALSO

Catmandu::Fix