Hi Graham, > That sounds good, but when you say for free, is that becuase Xml > Schema Data types allow it? Yes, "-INF" and "INF" are valid xsd:float / xsd:double values: <http://www.w3.org/TR/xmlschema-2/#float> <http://www.w3.org/TR/xmlschema-2/#double> Best regards, Lars -- Semagia <http://www.semagia.com>