This schema defines the types and elements needed to retrieve client packages from the server or for the client to post packages to the server. This type defines the Package Availability List (PAL). This item contains information about the package and a link that the client uses to download or post the package. This type defines a product in the PAL. This item indicates the package's size. This type allows a choice of X.500 Distinguished Name, Subject Key Identifier, Issuer and Serial Number tuple, or URI. This type holds the issuer Distinguished Name and serial number of a referenced certificate. This type identifies each package that a client may retrieve from the server with a 4-digit string. This type indicates the date and time (YYYY-MM-DDTHH:MM:SSZ) that the client last acknowledged successful receipt of the package; it is absent if a) there is no indication that the the package has been downloaded or b) the PAL entry corresponds to a pointer to the next PAL. This type holds an X.500 Distinguished Name. This type holds a hex string representing the value of a certificate's SubjectKeyIdentifier. This type holds a URI but is length limited.