In
the data warehouse context, proposals in the literature focus on the representation
Temporal Semistructured Data Models and Data Warehouses 2
Copyright ?© 2007, Idea Group Inc. Copying or distributing in print or electronic forms without written permission
of Idea Group Inc. is prohibited.
of successive versions of a document (B?™bel, Eder, Koncilia, Morzy, & Wrembel,
2004; Marian et al., 2001).
In this chapter, we focus on the representation of semistructured warehouses, and
consider issues related to their graph-based representations. In particular, we use a
temporal semistructured data model, based on labeled graphs, to represent information
stored in a data warehouse. Moreover, we discuss the set of constraints needed to
manage in a correct way the warehouse time and the operations useful to handle the
considered information. Topics related to the querying, the refreshment, and maintenance
of semistructured data warehouses are not considered in this chapter.
The structure of the chapter is as follows: in the Background section we briefly
describe the literature related to semistructured data, temporal semistructured data,
and temporal data warehouses. In the Representing Semistructured Temporal Data
Warehouses section we consider the main issues related to the management of temporal
information in semistructured data warehouses, describe how to represent a
data warehouse by means of a temporal graph-based data model, and define the set
of constraint needed to manage time in the warehouse context.
Pages:
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515