document( afile.xml )//product in Java

Making Quick Response Code in Java document( afile.xml )//product

document( afile.xml )//product
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A slightly more complex XQuery expression selects the warranty node for each product.
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FOR $product in //product RETURN $product/warranty
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XQuery is in its early stages of completion and there are not many products around that fully implement the specification. The latest version of Software AG s Tamino server has some support for XQuery, but a full XQuery engine has yet to be implemented. We discuss XQuery in more detail in chapter 3, within our discussion of XML data persistence. You can get all the details about XQuery at http://www.w3c.org/XML/Query.
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Data storage technologies
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XML is data, so it should be no surprise that there are a variety of technologies under development for storing native XML data. The range of technologies and products is actually quite large, and it is still unclear which products will emerge as the leaders. Storing XML on the file system is still very popular, but storing XML in a textual, unparsed format is inefficient and greatly limits its usability. Static documents require reparsing each time they are accessed. An alternative mechanism to storing text files is the Persistent Document Object Model (PDOM). PDOM implements the W3C DOM specification but stores the parsed XML
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The Java APIs for XML
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document in binary format on the file system. In this fashion, it does not need to be reparsed for subsequent access. PDOM documents may be generated from an existing DOM or through an XML input stream, so the document is not required to be in memory in its entirety at any given time. This is advantageous when dealing with large XML documents. PDOM supports all of the standard operations that you would expect from a data storage component, such as querying (via XQL), inserting, deleting, compressing, and caching. We offer an example of using this technique for data storage in chapter 3. You can learn more about PDOM at http://xml.darmstadt.gmd.de/xql/. Another alternative to static file system storage is the use of native-XML databases. Databases such as Software AG s Tamino are designed specifically for XML. Unlike relational databases, which store hierarchical XML documents in relational tables, Tamino stores XML in its native format. This gives Tamino a significant performance boost when dealing with XML. Despite the appearance of native-XML database vendors, traditional database vendors such as Oracle and IBM had no intention of yielding any of the data storage market just because traditional relational databases did not handle XML well initially. The major relational vendors have built extensions for their existing products to accommodate XML as a data type and enable querying functionality. This is advantageous for many companies that rely heavily on RDBMS products and have built up strong skill-sets in those technologies. Figure 2.7 summarizes your options for XML data storage.
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Relational Databases Native XML Databases
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Parsed Binary Files
XML data storage alternatives
The Java APIs for XML
The Java development community is actively following and contributing to the specification of many of the XML technologies discussed in section 2.1.
XML and Java
Additionally, Java is often the first language to implement these emerging technologies. This is due largely to the complimentary nature of platform independent code (Java) and data (XML). However, XML API development in Java has historically been disjointed, parallel, and overly complicated. Various groups have implemented XML functionality in Java in different ways and at different times, which led to the proliferation of overlapping, noncompatible APIs. To address this issue and make developing XML-aware applications in Java simpler, Sun Microsystems is now coordinating Java XML API development via the Java Community Process (JCP). Under this process, the Java development community is standardizing and simplifying the various Java APIs for XML. Most of these efforts have been successful, although a couple of the standard specifications still have overlapping scope or functionality. Nevertheless, XML processing in Java has come a long way in 2000 and 2001. The Java APIs for XML (JAX) is currently a family of related API specifications. The members of the JAX family are summarized in table 2.1. In this section, we introduce each member of JAX and discuss its current state of maturity. For those JAX members with an existing reference implementation, we also provide usage examples for each.
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