- - Multiple attributes can only be combined using 'and'. 'or' and bracketing is not supported.
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+ - Multiple attributes can only be combined using 'and'. 'or' and bracketing is not supported.
+
+Query Extensions
+================
+
+Ancestor Axis
+-------------
+
+The ancestor axis can be added to any CPS path query.
+
+**Syntax**: ``//<cps-path>/ancestor::<ancestor-path>``
+ - ``cps-path``: Any CPS path query.
+ - ``ancestor-path``: Partial path to ancestors of the target node. This can contain one or more ancestor nodes separated by a /.
+
+**Examples**
+ - ``//book/ancestor::categories``
+ - ``//categories[@genre="SciFi"]/book/ancestor::bookstore``
+ - ``book/ancestor::categories[@code=1]/books``
+
+**Limitations**
+ - Ancestor list elements can only be addressed using the list key leaf.
+ - List elements with compound keys are not supported.
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