Abstract: The subject invention pertains to systems and methods for iterating over or otherwise traversing a collection of objects or elements. More specifically, mechanisms are provided for handling both conventional non-nested streams such as enumeratables as well as nested streams. Nested streams provide a more efficient mechanism for traversing certain objects such as recursive generators. One problem with nested streams is that they need to be flattened or simplified. Techniques are provided herein to allow such streams to be flattened quickly and efficiently. Moreover, systems and methods are disclosed to preserve backward compatibility of optimized nested stream processing with conventional non-nested streams.

Abstract: A data mapping architecture for mapping between two or more data sources without modifying the metadata or structure of the data sources themselves. Data mapping also supports updates. The architecture also supports at least the case where data sources that are being mapped, are given, their schemas predefined, and cannot be changed. The architecture includes a mapping component that receives respective metadata from at least two arbitrary data models, and maps expressions between the data models.

Abstract: A Relational Schema Definition (RSD) language that uses metadata of the relational database to generate an implementation-neutral or implementation-specific format that represents the precise database structure and data. The RSD language is a declarative description language such that an RSD file can then be used offline in a disconnected environment to reconstruct and use the database.