Databases Reference
In-Depth Information
Figure 1: An XML document.
Figure 2. In this figure, triangle nodes, circle nodes and rectangular nodes represents
element nodes, attribute nodes and document nodes, respectively.
3
Query Languages
Proposal of query languages has been made for the last couple of years. After
intensive discussion at Query Language Workshop in December 1998
24),
W3C has
organized the XML Query Working Group. The goal of the Working Group is to
produce a data model for XML documents, a set of query operators, and a query
language based on these query operators
28)
. The data model will be based on the
XML Infoset
27)
, and will support Namespace
25)
. Requirements for the data model
include the support for a collection of documents and references.
