/// <summary>
/// Registers a filter for nodes.
/// </summary>
/// <remarks>
/// <para>
/// Only nodes for which the predicate returns true are part
/// of the comparison. By default nodes that are neither
/// document types nor XML declarations are considered.
/// </para>
/// </remarks>
public CompareConstraint WithNodeFilter(Predicate <XmlNode> nodeFilter)
{
diffBuilder.WithNodeFilter(nodeFilter);
return(this);
}