No one wants to learn six different dialects of a query language and then relearn it every six months.
Nevertheless, throughout the design process, a reasonably stable consensus existed in the working group about at least some of the principles that should underlie the design of an XML query language.
Complex searches for academics and researchers are supported by a special query language.
Therefore, each operator in an XML query language must be well defined for all these possible inputs.
An example is the language SQL (Structured query language), which forms the backbone of most relational database query system.
This is a good example of a behavior that should simply be documented as not perfectly conforming to the II CE query language.
This paper presents a map query algorithm and defines a query language based on mobile equipment, termed the embed geography SQL (EGSQL).
JPA has a very rich query language you can use, called EJB-QL.
This is the basic reason why a query language for XML data is extremely important in a connected world.
Each query planner will generate the appropriate query language and send the request on to their respective query execution layer.
Distributed geographic structure query language DGSQL