[XML-SIG] xml silly question

[Martin v. Loewis]

> Is it valid xml to have an attribute with an empty string as a value ?

AttValue is defined as

  AttValue ::= '"' ([^<&"] | Reference)* '"' 
             | "'" ([^<&'] | Reference)* "'"

and there is no constraint on it, so yes, that is allowed.

Regards,
Martin