/// <summary>Find or create a qualifier node under a given parent node.</summary>
/// <remarks>
/// Find or create a qualifier node under a given parent node. Returns a pointer to the
/// qualifier node, and optionally an iterator for the node's position in
/// the parent's vector of qualifiers. The iterator is unchanged if no qualifier node (null)
/// is returned.
/// <em>Note:</em> On entry, the qualName parameter must not have the leading '?' from the
/// XMPPath step.
/// </remarks>
/// <param name="parent">the parent XMPNode</param>
/// <param name="qualName">the qualifier name</param>
/// <param name="createNodes">flag if nodes shall be created</param>
/// <returns>Returns the qualifier node if found or created, <c>null</c> otherwise.</returns>
/// <exception cref="XmpException"></exception>
private static XmpNode FindQualifierNode(XmpNode parent, string qualName, bool createNodes)
{
Debug.Assert(!qualName.StartsWith("?"));
var qualNode = parent.FindQualifierByName(qualName);
if (qualNode == null && createNodes)
{
qualNode = new XmpNode(qualName, null)
{
IsImplicit = true
};
parent.AddQualifier(qualNode);
}
return(qualNode);
}