	rxml:cookie
	rxml:get-permlink
	rxml:iso-gmtime
	rxml:iso-time
	rxml:metadata
	rxml:mktime
	rxml:node-set
	rxml:pike-expression
	rxml:resolve-permlink
	rxml:variable
	boolean
	ceiling
	concat
	contains
	count
	current
	document
	element-available
	false
	floor
	format-number
	function-available
	generate-id
	id
	key
	lang
	last
	local-name
	name
	namespace-uri
	normalize-space
	not
	number
	position
	round
	starts-with
	string
	string-length
	substring
	substring-after
	substring-before
	sum
	system-property
	translate
	true
	unparsed-entity-uri

substring()

Arguments:	string, number, [number]
Returns:	string

Returns the substring of the first argument string starting at the position specified in the second argument and with the length specified in the third argument. If no length is provided all remaining characters are returned. The position of the first character is 1.