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Key XML Technologies for Mobile Computing in Java Printing datamatrix 2d barcode in Java Key XML Technologies for Mobile Computing




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3.3 Key XML Technologies for Mobile Computing use jsp data matrix barcode printer toincoporate ecc200 for java Code128 conformed to a giv jar datamatrix 2d barcode en set of rules. Validation of a document using an XML Schema or a DTD is an inspection process. 4.

Extraction processes copy a part of the document that they look into. The copied section may then be removed from the document being inspected or left in. 5.

Packaging processes are distributed processes that address the processing of distributed resources. The scope of such an initiative is simply huge. So, even the XML Pipeline speci cation clari es that the XML Pipeline addresses only a subset of those issues involved in providing a standard for specifying distributed processing of distributed resources.

In XML Pipeline, resources, as in the case of RDF, are identi ed by URIs: Anything that can be represented by a URI can be a resource. The controller is the entity that processes the XML Pipeline document. It rst validates the document, then determines what the rst process is, points the rst process to its input, tells it to run, and redirects the output where it should go.

The controller processes the instructions on the document based on the availability of the input. An obvious implementation may require multiple passes through the document. Other implementations may use SAX to map the events to language-speci c event models.

Regardless of the implementation, the controller gures out which processes depend on which, then produces the results of ones with appropriate available input in the order of availability of input. Although XML Pipeline and similar pipelining languages are not likely to be used on most mobile clients, they can prove invaluable in building distributed mobile applications that are not tightly coupled to commercial implementations, thereby allowing more exibility in implementing the initial solution and in changing the implementation during the lifetime of the mobile application system. Cocoon, for example, uses a pipelining system.

Though Cocoon s Sitemap, which essentially accomplishes the same purpose as an XML Pipeline document for content generation, is written with a different vocabulary set, structurally and functionally, it is very similar to an XML Pipeline document. Cocoon is one of the most popular frameworks for generating the right type of content for the right type of device/user interface (and, as we will see later in this book, it can be used for much more than just that). XML Pipeline has become a recommendation very recently, and even more recent is the release of the rst (currently only) reference implementation for it by Sun Microsystems.

It is very likely that many frameworks, such as Cocoon, will eventually migrate from proprietary pipelining languages to XML Pipeline. XML Pipeline may need to be extended to accommodate features special for some mobile application frameworks, but then, that is one of the beauties of XML: It is extensible!. 3.3.5 WBXML The WAP Binary Ext barcode data matrix for Java ensible Markup Language (WBXML) format de nes a way to represent XML in 0 s and 1 s instead of text. The primary purpose of WBXML is to reduce bandwidth requirements on transporting XML documents..

XML: THE DOCUMENT AND METADATA FORMAT The interest in WB Data Matrix for Java XML has gone far beyond WAP. The argument for binary XML is that it reduces bandwidth and the time required for transport. Arguments also have been made that parsing binary XML may be more ef cient because machines are better at dealing with numbers than text.

However, this is in doubt. Namely, without knowing the contextual usage of XML, it is questionable whether it is possible to come up with an encoding scheme that applies with consistent ef ciency across one set of domains although not causing loss of ef ciency across another set of domains. So, although WBXML is a binary representation of XML, it has been designed with a bias toward WAP; it does not necessarily work well for other mobile application frameworks and protocols.

There are several open-source tools that provide parsing of WBXML. KXML, an open-source application that we previously referred to as an XML parser in the J2ME environment, has the ability to parse WBXML for the J2ME environment. KXML is a DOM-based parser for WBXML.

If you are looking for a SAX WBXML parser, check out Trantor [Trantor 2002], a collection of various open-source applications for mobile devices. Making XML parsing, transport, and translation more and more ef cient is one of the hot topics of current discussions. Resource-starved mobile applications can certainly use faster ways of dealing with XML and requiring less bandwidth to transport it.

There is currently no prevailing standard, nor implementation, nor even consensus in the industry on how to do this. We will not look at WBXML in any depth here. If you are interested in nding out more about WBXML, check out W3C s Web site.

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