1. A non-transitory computer readable medium including program code for providing a message-based interface for exchanging information about libraries of properties that represent object qualities, which are configured for reuse in further describing instances or groups of business objects in specific application areas, the non-transitory computer readable medium comprising: program code for receiving via a message-based interface derived from a common business object model, where the common business object model includes business objects having relationships that enable derivation of message-based interfaces and message packages, the message-based interface exposing at least one service as defined in a service registry and from a heterogeneous application executing in an environment of computer systems providing message-based services, a first message for requesting information about libraries of properties that represent object qualities, which are configured for reuse in further describing instances or groups of business objects in specific application areas, that includes a first message package derived from the common business object model, the first message package hierarchically organized in memory as and including: at a first hierarchical level within the first message package a property library query message entity; and at the first hierarchical level within the first message package, a property library package, where the property library package includes, at a second hierarchical level within the first message package, a property library entity, a name package, a property data type package, a property package, and a property group package, where the property library entity includes, at a third hierarchical level within the first message package, a universally unique identifier (UUID) and an identifier (ID); program code for processing the first message based on the hierarchical organization of the first message package, where processing the first message includes unpacking the first message package based on the hierarchical organization of the first message package, the specific grouping and order of the hierarchical elements, and the first message package's derivation from the common business object model, wherein the particular hierarchical organization of the first message package and the specific grouping and order of the hierarchical elements are used at least in part to identify the first message; and program code for sending a second message to the heterogeneous application responsive to the first message, where the second message includes a second message package derived from the common business object model to provide consistent semantics with the first message package.