Returns a Boolean

Each function in Table 6.2 returns a Boolean.

Table 6.2: XPath 1.0 functions that return a Boolean value
Open table as spreadsheet

Function	Meaning
contains(string, string)	Indicates whether the first argument includes a string equal to the second argument. Given our main example, each the following expressions resolves to true because the string lark is within the string Skylark. contains('Skylark','lark') contains(descendant::Model[4],'lark') contains(descendant::Model[position() >= 4],'lark') The first argument in the third expression returns the nodes whose string values are Skylark and Speedster; however, only the first node is available, and the only tested string value is Skylark. The next expression resolves to false because string operations are case-sensitive. contains('Skylark,'LARK')
false()	Returns false
not(Boolean)	Returns the opposite value to the value of the argument.
starts-with (string, string)	Indicates whether the first argument starts with a string equal to the second argument. Given our main example, each the following expressions resolves to true because the string Sky is at the beginning of the string Skylark. starts-with('Skylark','Sky') starts-with(descendant::Model[4],'Sky') starts-with(descendant::Model[position() >= 4],'Sky') The first argument in the third expression returns the nodes whose string values are Skylark and Speedster; however, only the first node is available, and the only tested string value is Skylark The next expression resolves to false because string operations are case-sensitive. starts-with('Skylark','SKY'
true()	Returns true.