The Acknowledge verb is used to acknowledge the application receipt of a Process request. This function conveys the result of the original request. An example of this is Acknowledge PO, where a Process PO has been issued and the corresponding business application acknowledges the receipt of the PO and responds with an acceptance or a counter offer.

Contains a set of information about assessment services or tests available to a customer. Enables the discovery of "Package IDs" which are necessary to place an order using HR-XML's assessment order specification. A "Package" may consist of one or more assessment instruments. An "assessment package" is the marketable unit of assessment or testing services that may be ordered. See detailed documentation of AssessmentCatalog components.