B2B Integration : A Practical Guide to Collaborative E-commerce

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Document type definitions (DTD) Extensible Markup Language (XML) 171 An XML document is essentially a structured medium for storing information. But how does an application identify which XML document is valid or not? In order to assess the validity of an XML document, the application needs to establish exactly to which structure the information within the document must adhere. This is accomplished with a schema, which is a model used to describe the structure of information within an XML document. Schemas are used in XML to model a class of data. One of the principal uses of structured information is to enable data interchange. Different industries create consortia to specify the content model on which they all agree and which they use to mark up their information so that they can share it with each other easily and efficiently. In the context of structured information, that content model is defined as a DTD or a schema. DTDs are a means of establishing a schema for XML documents. The purpose of a DTD is to define the legal building blocks of an XML docment. It defines the document structure with a list of legal elements. A DTD can be declared inline in an XML document, or as an external reference. Example of a DTD: Continue on page 172
172 B2B Integration — A Practical Guide to Collaborative E-commerce Continued from page 171 The DTD is interpreted like this: lELEMENT order (in line 2) defines the element 'order' as having a buyer element and one or more occurrences of 'lineltem' element. lELEMENT buyer (in line 3) defines the 'buyer' as having elements 'name, address, city, state and zip'. !ELEMENT name (in line 4) is defined to be of the type 'PCDATA and so on ... Example of an XML document with an external DTD: ]> Beautiful Home Departmental Store 18 Middlesex Mall Edison NJ 08817 Hand-painted lamp 50 29.95 Table-mat 100 5.95 The file order.dtd contains the DTD.
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Chapter 2 Components, Benefits, Cha
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Chapter 4 Enterprise Application In
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Chapter Q Integration Brokers The f
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Chapter "] 2 Wireless Technologies
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Company Brience Everypath GadgetSpa
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Chapter "] 5 E-Marketplaces and Col
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