internal override bool IsValidChildType(XmlNodeType type)
{
switch (type)
{
case XmlNodeType.ProcessingInstruction:
case XmlNodeType.Comment:
case XmlNodeType.Whitespace:
case XmlNodeType.SignificantWhitespace:
return true;
case XmlNodeType.DocumentType:
if (DocumentType != null)
throw new InvalidOperationException(SR.Xdom_DualDocumentTypeNode);
return true;
case XmlNodeType.Element:
if (DocumentElement != null)
throw new InvalidOperationException(SR.Xdom_DualDocumentElementNode);
return true;
case XmlNodeType.XmlDeclaration:
if (Declaration != null)
throw new InvalidOperationException(SR.Xdom_DualDeclarationNode);
return true;
default:
return false;
}
}
// the function examines all the siblings before the refNode
