## Rule `AttributeValue_3`

`AttributeValue` |  | `POSITION` `XmlPath_opt` `AttributeName_opt`

#### Description

An attribute value may be a deep reference into the XML tree of the CST child at ``POSITION``, optionally followed by an ``XmlPath``. Then comes an optional ``AttributeName`` consisting of a slash `'/'` followed by an unquoted, single-quoted, or double-quoted string denoting an attribute name in the referenced XML subtree.

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