Abstract: A computer readable storage medium includes executable instructions to derive from a database schema an irreducible ambiguous group comprising a sub-schema with a set of vertices wherein any two vertices are part of a loop. Contexts are defined on the sub-schema. For each context, joins in the sub-schema are designated as mandatory joins, excluded joins and neutral joins. A selection of a context from multiple contexts invoked by a path characterizing a query is processed. The query is resolved using the context.

Abstract: Some aspects include determination of a report structure defining a frame, the frame associated with a graphical primitive and a data axis, obtaining data associated with the data axis from a structured data source, creation of one or more instances of the graphical primitive based on the data associated with the data axis and on an axis expression of a layout script, determination of one or more graphical properties associated with each of the one or more instances of the graphical primitive based on the data associated with the data axis and on a property expression of the layout script, and outputting a report including the one or more instances of the graphical primitive and the one or more graphical properties associated therewith.

Abstract: A computer readable storage medium includes executable instructions to derive from a database schema an irreducible ambiguous group comprising a sub-schema with a set of vertices wherein any two vertices are part of a loop. Contexts are defined on the sub-schema. For each context, joins in the sub-schema are designated as mandatory joins, excluded joins and neutral joins. A selection of a context from multiple contexts invoked by a path characterizing a query is processed. The query is resolved using the context.