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10.4 Oracle Application Server Components and XML
Several
of the Oracle Application
Server components use XML in various ways. Their use of XML ranges
from simply using XML documents (to save configuration data) to
creating XML documents as output. The most notable use of XML by
Oracle Application Server components is found in
OracleAS Portal and OracleAS
Report Services. These two Oracle
Application Server components can use XML as a data source, and
produce XML documents for output. This capability makes it possible
to use the XML SQL Utility or XSQL Pages to produce input for
OracleAS Portal and OracleAS Reports Services or use output from
OracleAS Portal and OracleAS Reports Services to update a database
with XML SQL Utility or XSQL Pages, or both.The OracleAS Wireless component, covered
separately in Chapter 14, uses XSLT
transformation bidirectionally to enable alternative presentation
layers for web-based applications to wireless devices such as
handheld computers and cell phones. Web Services, the topic of Chapter 11, employ XML to provide a computer-centric,
rather than human-centric, view of the Web. Web Services enable
heterogeneous computer systems to exchange data over an intranet or
the Internet.OracleAS Portal's
Portal Developer Kit Integration
Services (PDKIS) allows you to extract data from an external source
identified by a URL. If the URL points to a well-formed HTML
document, the HTML document can be parsed and used for content in a
portlet. PDKIS can also transform an
HTML document into an
XHTML document. (As mentioned earlier, XHTML is an XML version of
HTML.) The XHTML document can then be further transformed using an
XSL stylesheet to create content for a portlet.OracleAS Reports Services can use an XML document as a data source
for a report. It can also output reports as XML documents and perform
XSL transformations on report output.
