The state or degree of mastery or adeptness obtained or achieved for a given competency. A proficiency level is expressed as a score a point scale or a mark among range of values.

Allows the implementer to extend the base HR-XML specification.
This is done by defining the additional information in XML Schema and referencing the new schema in the xml instance document throught the use of namespaces. Once this is done the additional information defined there can be carried in the BOD XML instance document.