Recently, the database research literature has seen an explosion of publications with the
goal of using an RDBMS to store and/or query XML data. The problems addressed and …

XML employs a tree-structured data model, and, naturally, XML queries specify patterns of
selection predicates on multiple elements related by a tree structure. Finding all occurrences …

XML is quickly becoming the de facto standard for data exchange over the Internet. This is
creating a new set of data management requirements involving XML, such as the need to …

Virtually all proposals for querying XML include a class of query we term “containment
queries”. It is also clear that in the foreseeable future, a substantial amount of XML data will …

XML queries typically specify patterns of selection predicates on multiple elements that have
some specified tree structured relationships. The primitive tree structured relationships are …

Protecting rights over relational data is of ever increasing interest, especially considering
areas where sensitive, valuable content is to be outsourced. A good example is a data …

Though skyline queries already have claimed their place in retrieval over central databases,
their application in Web information systems up to now was impossible due to the distributed …

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Relational query optimizers have traditionally relied upon table cardinalities when
estimating the cost of the query plans they consider. While this approach has been and …

As XML has developed over the past few years, its role has expanded beyond its original
domain as a semantics-preserving markup language for online documents, and it is now …