query language

A problem in modern command and control situations is that much data is available from different sensors. Several sensor data sources also require that the user has knowledge about the specific sensor types to be able to interpret the data.To alleviate the working situation for a commander, we have designed and constructed a system that will take input from several different sensors and subsequently present the relevant combined information to the user. The users specify what kind of information is ...

The work presented in this thesis is related to XML (Extensible Markup Language) developed by World Wide Web Consortium (W3C)1. XML has be-come a dominant standard in the Internet and majority of data being exchanged on the Web is encoded using it. The thesis presents a type system for a substantial fragment of XML query language Xcerpt. The system is descriptive; the types associated with Xcerpt constructs are sets of data terms and approximate the semantics of the constructs. A formalism ...