Plug-and-Play Queries for Temporal Data Sockets.

Plug-and-play queries are portable, reliable, and easier to code. When a plug-and-play query is plugged into a data socket, the socket transforms the data to the shape needed by the query. If data is annotated with metadata, the semantics of the metadata potentially impacts the transformation. In this paper we describe how to account for the metadata in a transformation. We focus on temporal metadata and show how a transformation can preserve temporal semantics. We also show how the transformation can be driven by the metadata, for instance, the temporal metadata could be used to create data versions.