XPath operator
Logical and / or
`and` binds tighter than `or`, and both are words rather than symbols — && and || do not exist.
XPath spells its logical operators as words. `and` has higher precedence than `or`, so a or b and c means a or (b and c); parenthesise when the intent is otherwise.
Both convert their operands to booleans, which means a node-set operand tests presence rather than value.
- Syntax
boolean and boolean- Returns
- boolean
- Kind
- Operator
- Version
- XPath 1.0 (libxml2)
Worked examples
Each result below is what the evaluator returned, asserted on every test run. An empty result means an empty node-set — which is an answer, not an error.
The sample documents
Every example on this page runs against this document. The sitemap one is namespaced on purpose — almost every real XML document is, and that changes which expressions match.
<?xml version="1.0" encoding="UTF-8"?>
<order id="A-1001" tier="gold">
<customer country="NO">Ada Lovelace</customer>
<lines>
<line sku="WIDGET-1" qty="2"><price>14.50</price></line>
<line sku="WIDGET-2" qty="1"><price>39.00</price></line>
<line sku="GIFT-WRAP" qty="1"><price>0.00</price></line>
</lines>
<note> Deliver after 09:00 </note>
</order>Related
- boolean() and not()Converts to true or false. A node-set is true when it is non-empty — which is why [not(x)] means 'has no x'.
- Predicates [ ]Filters a node-set. Order matters, and a numeric predicate is not the same as a positional one applied afterwards.
- Comparison = and !=Comparison against a node-set is existential, which makes != mean something other than 'not ='.
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