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-rw-r--r--docs/cps-path.rst27
1 files changed, 24 insertions, 3 deletions
diff --git a/docs/cps-path.rst b/docs/cps-path.rst
index 160aa9389c..aec87cd436 100644
--- a/docs/cps-path.rst
+++ b/docs/cps-path.rst
@@ -51,8 +51,8 @@ General Notes
- String values must be wrapped in quotation marks (U+0022) or apostrophes (U+0027).
- String comparisons are case sensitive.
-Supported Functions
-===================
+Supported Queries
+=================
Get List Elements by Any Attribute Value
----------------------------------------
@@ -107,4 +107,25 @@ Get Any Descendant by Any Attribute Value
**Limitations**
- Only string and integer values are supported (boolean and float values are not supported).
- - Multiple attributes can only be combined using 'and'. 'or' and bracketing is not supported. \ No newline at end of file
+ - 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. \ No newline at end of file