Location of the XML file that is expected to contain the Policy or PolicySet element to be referenced by a Policy(Set)IdReference in the root PolicySet loaded by a root policy Provider. The location may also be a file pattern in the form file://DIRECTORY_PATH/*SUFFIX or file://DIRECTORY_PATH/**...*SUFFIX, etc. (arbitrarily long sequence of wildcard characters) in which case the location is expanded to all regular files in the directory located at DIRECTORY_PATH with suffix SUFFIX, not crossing directory boundaries if using a single wildcard; but crossing directory boundaries if using more than a single wildcard (there may not be a SUFFIX; in other words, SUFFIX may be an empty string). The number of wildcards in the sequence **....* defines the maximum number of directory levels to search.

In the location, you may use placeholders enclosed between ${ and } for the following properties:

• The global property PARENT_DIR for defining - in a generic way - a path relative to the parent directory to the XML file where this is used;
• Java system properties;
• System environment variables.

You may use ! (exclamation mark) as a separating character between the placeholder property name and a default value that is used if the property is undefined. E.g. ${PARENT_DIR!/home/foo/conf} will be replaced with /home/foo/conf if PARENT_DIR is undefined.