Schema Evolution publication categorizer

Evolving the database that is at the core of an Information System represents a difficult maintenance problem
that has only been studied in the framework of traditional information systems. However, the problem is likely
to be even more severe in web information systems, where open-source software is often developed through
the contributions and collaboration of many groups and individuals. Therefore, in this paper, we present an in-
depth analysis of the

Supporting graceful schema evolution represents an unsolved problem for traditional information systems that is further exacerbated in web information systems, such as Wikipedia and public scientific databases: in these projects based on multiparty cooperation the frequency of database schema changes has increased while tolerance for downtimes has nearly disappeared.

Multiversion support for XML documents is needed in many critical applications, such as software configuration control, cooperative authoring, web information warehouses, and ”e-permanence” of web documents. In this paper, we introduce efficient and robust techniques for: (i) storing and retrieving; (ii) viewing and exchanging; and (iii) querying multiversion XML documents. We first discuss the limitations of traditional version control methods, such as RCS and SCCS, and then propose novel techniques that overcome their limitations.