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Why Use XML
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XML technology enables companies to develop application-specific languages that better describe their business data. By applying XML technology, one is essentially creating a new markup language. For example, an application of XML would produce the likes of an Invoice Markup Language or a Book Layout Markup Language. Each markup language should be specific to the individual needs and goals of its creator. Part of creating a markup language includes defining the elements, attributes, and rules for their use. In XML, this information is stored inside a document type definition (DTD). JEE 1.4 uses XML Schemas instead of a DTD. Also, some JEE
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XML and JEE
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products are XML Schema based such as WebLogic Integration. A DTD can be included within an XML document, or it can be external. If the DTD is stored externally, the XML document must provide a reference to the DTD. If a document does provide a DTD and the document adheres to the rules specified in the DTD, it is considered valid. SAX (Simple API for XML) is a Java technology interface that enables applications to integrate with any XML parser to receive notification of parsing events. Every major Java technology-based parser available now supports this interface. Here are some other ways that the Java platform supports the XML standard:
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n The Java platform intrinsically supports the Unicode standard, simplifying
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the processing of an international XML document. For platforms without native Unicode support, the application must implement its own handling of Unicode characters, which adds complexity to the overall solution.
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n The Java technology binding to the W3C Document Object Model (DOM)
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provides developers with a highly productive environment for processing and querying XML documents. The Java platform can become a ubiquitous runtime environment for processing XML documents.
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n The Java platform s intrinsic support of the object-oriented programming
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means that developers can build applications by creating hierarchies of Java objects. Similarly, the XML specification offers a hierarchical representation of data. Because the Java platform and XML content share this common underlying feature, they are extremely compatible for representing each other s structures.
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n Applications written in the Java programming language that process XML
can be reused on any tier in a multi-tiered client/server environment, offering an added level of reuse for XML documents. The same cannot be said of scripting environments or platform-specific binary executables.
Electronic Data Exchange and E-Commerce
Given the industry s vast knowledge of communications, networking, and data processing, validating and processing data from other departments and/or enterprises should be a simple task. Unfortunately, that s not the case. Validating data formats and ensuring content correctness are still major hurdles to achieving simple, automated exchanges of data.
2: Common Architectures and Protocols
Using XML technology as the format for data exchange can quickly remedy most of these problems for the following reasons:
n Electronic data exchange of nonstandard data formats requires developers to
build proprietary parsers for each data format. XML technology eliminates this requirement by using a standard XML parser.
n An XML parser can immediately provide some content validation by ensuring
that all the required fields are provided and are in the correct order. This function, however, requires the availability of a DTD. Additional content validation is possible by developing applications using the W3C DOM. In addition, content and format validation can be completed outside of the processing application and perhaps even on a different machine. The effect of this approach is twofold: It reduces the resources used on the processing machine and speeds up the processing application s overall throughput because it does not need to first validate the data. In addition, the approach offers companies the opportunity to accept or deny the data at time of receipt instead of requiring them to handle exceptions during processing.
Electronic Data Interchange (EDI)
EDI is a special category of data exchange that nearly always uses a VAN (valueadded network) as the transmission medium. It relies on either the X12 or EDIFACT standards to describe the documents that are being exchanged. Currently, EDI is a very expensive environment to install and possibly requires customization, depending on the terms established by the exchanging parties. For this reason, a number of enterprises and independent groups are examining XML as a possible format for X12 and EDIFACT documents, although no decisions have been reached as of this writing.
Enterprise Application Integration (EAI)
EAI is best described as making one or more disparate applications act as a single application. This is a complex task that requires that data be replicated and distributed to the correct systems at the correct time. For example, when integrating accounting and sales systems, it can be necessary for the sales system to send sales orders to the accounting system to generate invoices. Furthermore, the accounting system must send invoice data into the sales system to update data for the sales representatives. If done correctly, a single sales transaction will generate the sales
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