# fn:contains-token - XPath XQuery Reference

Determines whether or not any of the supplied strings, when tokenized at whitespace boundaries, contains the supplied token,
            under the rules of the supplied collation.deterministiccontext-dependentfocus-independentdeterministiccontext-dependentfocus-independentIf $input is the empty sequence, the function returns false.Leading and trailing whitespace is trimmed from the supplied value of $token. If the trimmed value of $token
            is a zero-length string, the function returns false.The collation used by this function is determined according to the rules in .The function returns true if and only if there is string in $input which, 
            after tokenizing at whitespace boundaries, contains a token
         that is equal to the trimmed value of $token under
         the rules of the selected collation.That is, the function returns the value of the expression:some $t in $input!fn:tokenize(.) satisfies 
                 compare($t, fn:replace($token, '^\s*|\s*$', ''), $collation) eq 0)fn:contains-token("red green blue ", "red")true()fn:contains-token(("red", "green", "blue"), " red ")true()fn:contains-token("red, green, blue", "red")false()fn:contains-token("red green blue", "RED", "http://www.w3.org/2005/xpath-functions/collation/html-ascii-case-insensitive")true()Interior whitespace within $token will cause the function to return false,
         unless such whitespace is ignored by the selected collation.This function can be used for processing space-separated attribute values
            (for example, the XHTML and DITA class attribute),
            where one often needs to test for the presence
            of a single token in a space-separated list. The function is designed to work
            both when the attribute has been validated against an XSD list type, and when it
            appears as a single untyped string. It differs from the
            HTML 5 definition in that HTML 5 recognizes form feed (x0C) as a separator.
            To reproduce the HTML token matching behavior, the HTML ASCII case-insensitive collation
            should be used: see .