/// <summary>
/// Tweak old XMP: Move an instance ID from rdf:about to the
/// <em>xmpMM:InstanceID</em> property. An old instance ID usually looks
/// like "uuid:bac965c4-9d87-11d9-9a30-000d936b79c4", plus InDesign
/// 3.0 wrote them like "bac965c4-9d87-11d9-9a30-000d936b79c4". If
/// the name looks like a UUID simply move it to <em>xmpMM:InstanceID</em>,
/// don't worry about any existing <em>xmpMM:InstanceID</em>. Both will
/// only be present when a newer file with the <em>xmpMM:InstanceID</em>
/// property is updated by an old app that uses <em>rdf:about</em>.
/// </summary>
/// <param name="tree"> the root of the metadata tree </param>
/// <exception cref="XmpException"> Thrown if tweaking fails. </exception>
private static void TweakOldXmp(XmpNode tree)
{
if (tree.Name != null && tree.Name.Length >= Utils.UUID_LENGTH)
{
string nameStr = tree.Name.ToLower();
if (nameStr.StartsWith("uuid:"))
{
nameStr = nameStr.Substring(5);
}
if (Utils.CheckUuidFormat(nameStr))
{
// move UUID to xmpMM:InstanceID and remove it from the root node
XmpPath path = XmpPathParser.ExpandXPath(XmpConst.NS_XMP_MM, "InstanceID");
XmpNode idNode = XmpNodeUtils.FindNode(tree, path, true, null);
if (idNode != null)
{
idNode.Options = null; // Clobber any existing xmpMM:InstanceID.
idNode.Value = "uuid:" + nameStr;
idNode.RemoveChildren();
idNode.RemoveQualifiers();
tree.Name = null;
}
else
{
throw new XmpException("Failure creating xmpMM:InstanceID", XmpError.INTERNALFAILURE);
}
}
}
}