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The ability of the XML document language to abstract meta-data about information in an open format will increase the capabilities of Web sites and intranets A single, unifying, omnimorphic data format facilitates the reuse and repurposing of information and data across a variety of applications Because XML documents enable easy analysis by a variety of applications, knowledge workers can spot and understand trends among collections of data, or drill down for relevant information in related documents for data sources with a greater capability than before XML Users and novice developers will not need to learn all the protocols and acronyms because the tools will hide the unnecessary details The tools may even hide the concept of programming in order to make development more like word processing or graphics design; the underlying details may be transparent to all but advanced developers Nonprogrammers will think of an XML application as browsing or searching for information And in most applications, that s what it will be: information searching or data mining XML also provides a number of methods for importing other files and defining macros and shortcuts In an XML document, namespaces are used, especially in a DTD, to assign a URL to a name Named entities are used to assign a string or macro to a name In an XSL document, named styles are used to assign a style to a name and inline styles are used to define brief, local styles The World Wide Web Consortium (W3C) defined the XML effort in three steps: 1 XML the syntax rules 2 XLink the linking rules 3 XSL the presentation and transformation rules
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Executive Summary
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Some of the tools that support XML include DTDs, schemas, XSL, XSLT, DOM, XLink, XPointer, XPath, Namespace, SOAP, SAX, and XHTML Some of these tools are shown in Figure 11
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XML (Data)
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XLink (Links)
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XSL (Rules)
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DTD/ Schema
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DOM/ SAX
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XSLT/ XPointer
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FIGURE 11 Some of the basic tools that support XML include XSL, XLink, XSLT, XPointer, DTDs, schemas, DOM, and SAX Each of these technologies is described in more detail in later chapters
DTD The Document Type Definition defines the XML document, structures, rules, and elements The DTD is used to define the elements and tags in a document The tags in XML correspond to tags in HTML and they identify components in the document Typically, the DTD is placed at the top of a document, where its tags, rules, and definitions can easily be interpreted by an XML parser or browser The DTD is optional It can be shared from another application or it can be used to define unique tags that are required in a specific document Once tags are defined, they can be used anywhere and other users can copy them onto their own documents Tags define document elements, entities, and attributes Entities are the physical structure, and elements are the logical structure Attributes specify qualifiers for elements Schemas Schemas carry the same function as DTDs but in a different format and structure While DTDs follow the SGML syntax, schemas follow the XML syntax Because schemas follow the XML syntax, applications can easily manipulate schemas, extending the dynamic features, flexibility, and ability to customize an XML document This capability is in contrast to DTDs, which have a difficult syntax to modify by computer Therefore, schemas will add to the extensibility of XML documents over the current DTD methods
XSL The eXtensible Stylesheet Language refers to formatting objects that are similar to the Cascading Style Sheets (CSSs) in HTML However, XSL provides scripting, conditional, and decision capabilities that are not available under CSS So, XSL can be used to customize the presentation of an XML document for a variety of users and purposes XSLT The eXtensible Stylesheet Language Transformations is a scripting and pattern matching language, which includes features such as templates, patterns, scripting, and tree processing XSL is a more general language for building flexible style sheets XSLT is a subset of XSL, which includes processing instructions beyond what is conventionally considered style sheet capabilities In addition to providing a mechanism for presenting XML documents, XSLT instructions can be used to build scripts that can transform XML documents and data to work between other documents, other DTDs, and other schemas, by extracting information and data from the source document and converting them to another format DOM The Document Object Model (DOM) is an Application Programming Interface (API) that defines the standards for developing interactions with XML tree structured elements The DOM supplies a uniform method for external applications to interact with XML The DOM stores the XML document information in a predictable format so that an application can easily extract pertinent information and data XLink XML Linking Language (XLink or XLL) specification provides a functional approach to document linking using XML XLink includes flexible linking capabilities such as bi-directionality and custom linking capabilities XPointer is used for internal page access to specific locations or elements XPath defines the pathname to the specific locations or elements XML Namespaces Namespaces are used to collect data from multiple sources into one document and to tag the information with its respective source An XML namespace is a collection of universal resource identifier (URI) names The XML namespace specification provides the context for labeling and disambiguating tags with similar names but different intents For example, <Material> could refer to cloth, to a type of witness in a legal investigation, or to the products in a bill of materials In speaking, the context would be clear Now, with XML Namespace, the context will also be clear for computers SOAP The Simple Object Access Protocol (SOAP) increases the interoperability among applications and platforms by making legacy applica-
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