To enable context-awareness for many distributed mobile applications, architecture is needed that supports the collecting of disseminated context attributes. After the structuring and storing of context, the interpretation and adaptation with reference to the current context and changes of context must be applied. These tasks are common to a large set of context-aware applications and can be centralized in a context-aware middleware. This article shows the approach called Context Directory, which helps mobile applications to achieve context-awareness. The software architecture and as a proof of concept four categories of context-aware features are described.