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Comparing Single Values With = and !=
Comparing Single Values With = and !=
When neither object to be compared is a node set and the operator is
= or
!=, the XPath processor compares the objects by converting them to a common type and then comparing them. The XPath processor converts the objects to a common type as follows:
- If at least one object to be compared is Boolean, the XPath processor converts the other object to Boolean as if by applying the
boolean() function.
- If at least one object to be compared is a number, and neither is Boolean, the XPath processor converts the nonnumber object to a number as if by applying the
number() function.
If the objects to be compared are neither Boolean nor numeric, the XPath processor compares the string values of the objects as if by applying the
string() function to each object.
The
= comparison returns
true if and only if the objects are equal. The
!= comparison returns
true if and only if the objects are not equal. Numbers are compared for equality according to IEEE 754. Two Boolean values are equal if either both are
true or both are
false. Two strings are equal if and only if they both consist of the same sequence of Universal Character Set (UCS) characters.
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