Martin Desruisseaux created SIS-399:
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             Summary: When renaming "xsi:type" value, may need to declare a new 
namespace
                 Key: SIS-399
                 URL: https://issues.apache.org/jira/browse/SIS-399
             Project: Spatial Information Systems
          Issue Type: Bug
          Components: Metadata
    Affects Versions: 1.0
            Reporter: Martin Desruisseaux


{{TransformingReader}} converts XML element and attribute names from legacy 
standards to new standards, but there is one special case where instead of the 
attribute name, we need to convert attribute value: the {{xsi:type}} attribute. 
Example:

{code:xml}
<gmd:…>
  <gmd:name xsi:type="gmd:PT_FreeText_PropertyType">
    <gco:CharacterString>Some text in default language</gco:CharacterString>
    <gmd:PT_FreeText>
      <gmd:textGroup>
        <gmd:LocalisedCharacterString locale="#locale-fra">Same text in 
French</gmd:LocalisedCharacterString>
      </gmd:textGroup>
    </gmd:PT_FreeText>
  </gmd:name>
<gmd:…>
{code}

Conversion from legacy ISO 19139:2007 to new ISO 19115-3:2016 result in 
something like (omitting non-pertinent prefixes for this discussion):

{code:xml}
<…:…>
  <…:name xsi:type="lan:PT_FreeText_PropertyType">
    <gco:CharacterString>Some text in default language</gco:CharacterString>
    <lan:PT_FreeText>
      <lan:textGroup>
        <lan:LocalisedCharacterString locale="#locale-fra">Same text in 
French</lan:LocalisedCharacterString>
      </lan:textGroup>
    </lan:PT_FreeText>
  </…:name>
<…:…>
{code}

{{gmd}} prefix has been replaced by {{lan}} prefix in various places, but this 
is not a concern for elements like {{lan:PT_FreeText}} because the {{XMLEvent}} 
created by {{TransformingReader}} already contain the full namespace URI. The 
problem is in the {{xsi:type}} value, where we do not specify the namespace 
ourselves. Attempts to unmarshal this converted XML result in an error message 
complaining the the {{lan}} prefix has not been bound. The workaround would be 
to replace the following fragment:

{xml:code}
  <…:… xsi:type="gmd:PT_FreeText_PropertyType">
{xml:code}

by

{xml:code}
  <…:… xmlns:lan="http://standards.iso.org/iso/19115/-3/lan/1.0"; 
xsi:type="gmd:PT_FreeText_PropertyType">
{xml:code}

In other words, we need to insert a local {{Namespace}} event which was not 
present in the original XML document.




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