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A key advantage of XML over other data formats is the ability to convert an XML data set from one form to another in a generic manner. The technology that enables this translation is the eXtensible Stylesheet Language for Transformations (XSLT).
XSLT Simply stated, XSLT provides a framework for transforming the structure of an XML document. XSLT combines an input XML document with an XSL stylesheet to produce an output document.
DEFINITION
An XSL stylesheet is a set of transformation instructions for converting a source XML document to a target output document.
Figure 2.4 illustrates the XSLT process. Performing XSLT transformations requires an XSLT-compliant processor. The most popular open source XSLT engine for Java is the Apache Software Foundation s Xalan project. Information about Xalan can be found at http:/ /xml.apache.org/xalan-j.
XML and its uses
XSLT Processor XSL Stylesheet Parser Output from Stylesheet 1
XSL Stylesheet
Output from Stylesheet 2
XML Document
XSLT processing overview
An XSLT processor transforms an XML source tree by associating patterns within the source document with XSL stylesheet templates that are to be applied to them. For example, consider the need to transform our product catalog XML document into HTML for rendering purposes. This consists of wrapping the appropriate product data in the XML document with HTML markup. Listing 2.4 shows an XSL stylesheet that would accomplish this task.
Listing 2.4 Translating the product catalog for the Web
< xml version="1.0" > <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
Executes for the root element of <xsl:template match="/"> the source document <html> <head><title>My Products</title></head> <body> <h1>Products Currently For Sale in the U.S.</h1> <xsl:for-each select="//product"> <xsl:value-of select="@name"/> : $ <xsl:value-of select="./price[@unit='USD']"/> USD </xsl:for-each>
c Prints name and price
information
XML and Java
</body> </html> </xsl:template> </xsl:stylesheet>
The match attribute is an XPath expression meaning the root XML element. This template is therefore executed against the entire source document. Each product element in the source document will have its name attribute printed, followed by the string: $, its price in dollars, and the string USD.
XSLT processors can vary in terms of their performance characteristics. Most offer some way to precompile XSL stylesheets to reduce transformation times. As you will see in section 2.2, the JAXP API provides a layer of pluggability for compliant XSLT processors in a manner similar to parsers. This permits the replacement of one XSLT engine with another, faster one as soon as it becomes available. Details on XSLT can be found at http:/ /www.w3.org/Style/XSL.
Binary transformations for XML Note that the capabilities of XSLT are not limited to textual transformations. It is often necessary to translate textual data to binary format. A common example is the translation of business data to PDF format for display. For this reason the XSL 1.0 Recommendation also specifies a set of formatting objects. Formatting objects are instructions that define the layout and presentation of information. Formatting objects are most useful for print media and design work. Some Java libraries are already available to do the most common types of transformations. See chapter 5 for an example of the most common binary transformation required today, from XML format to PDF. 2.1.4 Messaging technologies
Numerous technologies for transmitting XML-structured data between applications and enterprises are currently under development. This is due to the tremendous potential of XML to bridge the gap between proprietary data formats and messaging protocols. Using XML, companies can develop standard interfaces to their systems and services to which present and future business partners can connect with little development effort. In this section, we provide a brief description of the most promising of these technologies.
XML and its uses
SOAP By far the most promising advances in this area are technologies surrounding the Simple Object Access Protocol (SOAP).
DEFINITION
SOAP is a messaging specification describing data encoding and packaging rules for XML-based communication.
The SOAP specification describes how XML messages can be created, packaged, and transmitted between systems. It includes a binding (mapping) for the HTTP protocol, meaning that SOAP messages can be transmitted over existing Web systems. Much of SOAP is based upon XML-RPC, a specification describing how remote procedure calls can be executed using XML. SOAP can be implemented in a synchronous (client/server) or asynchronous fashion. The synchronous method (RPC-style) involves a client explicitly requesting some XML data from a SOAP server by sending a SOAP request message. The server returns the requested data to the client in a SOAP response message. This is depicted in figure 2.5.
Remote Procedure Call (SOAP over HTTP(S))
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