validating parsers DTD checks in uniqueness checks in validation 2nd 3rd against a subset of rules choice of a schema language for of a master document of forms on server running 2nd with DTDs 2nd 3rd 4th 5th 6th 7th with schemas 2nd with XSDL 2nd 3rd [See also Schematron] value-of, Schematron element type value-of, XSLT instruction 2nd variable, XSLT instruction 2nd variables , in XSLT 2nd 3rd 4th error messages in global 2nd 3rd 4th local values of 2nd visual design vocabularies 2nd custom 2nd existing 2nd changes in for forms for metadata for news markup for text markup hierarchical 2nd human-readable specifications of transformations between 2nd 3rd 4th 5th [See also source definition] [See also source definition] [See also source definition] [See also source definition] [See also source definition]