???? the fact that \u0000 is legal character data is nothing to do with whether NUL is allowed in XML (which it isn't) the point of Roger's original mail is that \u0000 is, as far as XML is concerned, simply the 6 characters \ u 0 0 0 0 0  .  It is not a reference to character 0 in XML itself  although of course an application may choose to interpret "\u0000" or "NUL" or anything else as character 0 when processing the XML content.

David