TagLib breaks XMP metadataworkinggroup face tags

[Agendum]

When parsing XMP, it appears to set the tag parent type as a struct when it encounters a Description:

} else if (node.Is (RDF_NS, DESCRIPTION_URI)) {
    parent.Type = XmpNodeType.Struct;
} else {

Yet when it is written back out, the Description object is lost:

} else if (Type == XmpNodeType.Simple || Type == XmpNodeType.Struct) {
    var node = XmpTag.CreateNode (parent.OwnerDocument, Name, Namespace);
    node.InnerText = Value;

    if (Type == XmpNodeType.Struct) {
        // Structured types are always handled as a parseType=Resource node. This way, IsReallySimpleType will
        // not match for child nodes, which makes sure they are added as extra nodes to this node. Does the
        // trick well, unit tests that prove this are in XmpSpecTest.
        XmlAttribute attr = XmpTag.CreateAttribute (parent.OwnerDocument, XmpTag.PARSE_TYPE_URI, XmpTag.RDF_NS);
        attr.Value = "Resource";
        node.Attributes.Append (attr);
    }

    AddAllQualifiersTo (node);
    AddAllChildrenTo (node);
    parent.AppendChild (node);
}

This is causing an unmodified document to be written out differently, breaking apps which read face data.

Before (working):

<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="XMP Core 5.1.2">
  <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
    <rdf:Description rdf:about="" xmlns:xmp="http://ns.adobe.com/xap/1.0/" xmlns:mwg-rs="http://www.metadataworkinggroup.com/schemas/regions/" xmlns:stDim="http://ns.adobe.com/xap/1.0/sType/Dimensions#" xmlns:stArea="http://ns.adobe.com/xmp/sType/Area#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmp:ModifyDate="2016-06-03T23:37:34-07:00">
      <mwg-rs:Regions rdf:parseType="Resource">
        <mwg-rs:AppliedToDimensions stDim:w="2368" stDim:h="3464" stDim:unit="pixel"/>
        <mwg-rs:RegionList>
          <rdf:Bag>
            <rdf:li>
              <rdf:Description mwg-rs:Name="Person Name" mwg-rs:Type="Face">
                <mwg-rs:Area stArea:x="0.320735" stArea:y="0.369948" stArea:w="0.160895" stArea:h="0.132506" stArea:unit="normalized"/>
              </rdf:Description>
            </rdf:li>
          </rdf:Bag>
        </mwg-rs:RegionList>
      </mwg-rs:Regions>
    </rdf:Description>
  </rdf:RDF>
</x:xmpmeta>

After (TagLib-generated, broken):

<x:xmpmeta xmlns:x="adobe:ns:meta/">
  <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
    <rdf:Description xmp:ModifyDate="2024-10-03T18:47:40.4483443-07:00" xmlns:xmp="http://ns.adobe.com/xap/1.0/">
      <ns1:Regions rdf:parseType="Resource" xmlns:ns1="http://www.metadataworkinggroup.com/schemas/regions/">
        <ns1:AppliedToDimensions stDim:w="2368" stDim:h="3464" stDim:unit="pixel" xmlns:stDim="http://ns.adobe.com/xap/1.0/sType/Dimensions#"/>
        <ns1:RegionList>
          <rdf:Bag>
            <rdf:li rdf:parseType="Resource">
              <ns1:Name>Person Name</ns1:Name>
              <ns1:Type>Face</ns1:Type>
              <ns1:Area ns2:x="0.320735" ns2:y="0.369948" ns2:w="0.160895" ns2:h="0.132506" ns2:unit="normalized" xmlns:ns2="http://ns.adobe.com/xmp/sType/Area#"/>
            </rdf:li>
          </rdf:Bag>
        </ns1:RegionList>
      </ns1:Regions>
      <dc:creator xmlns:dc="http://purl.org/dc/elements/1.1/">
        <rdf:Seq>
          <rdf:li/>
        </rdf:Seq>
      </dc:creator>
    </rdf:Description>
  </rdf:RDF>
</x:xmpmeta>