The National Institute of Standards and Technology. Conformance test for W3C XML Schema Part 2: Datatypes. (See http://www.w3.org/TR/2001/PR-xmlschema-2-20010330/) Created Sep 24, 2001. File: NISTSchema-language-pattern-1.xsd This schema specifies a datatype, NISTSchema-language-pattern-1, which is derived by restriction of built-in type language by facet pattern with a value of: ([a-zA-Z]{2}|[iI]-[a-zA-Z]+|[xX]-[a-zA-Z]{1,8})(-[a-zA-Z]{3})*