Expands to the specified attribute value being removed in the current operation. It applies only to a modify operation.
Specify the name of the attribute. Supports variable expansion. For more information, see Variable Expansion.
If the token is used in a context where a node set is expected, the token expands to a node set containing all of the values for that attribute. If it is used in a context where a string is expected, the token expands to the string value found.