Tutorial 3 validating an xml document

Traditionally, DTD has been the standard for XML schema definition; however, XML usage has expanded dramatically in core application systems, being tailored for a wide range of purposes for which DTD is not fully capable of supporting.Given this development, the W3C recommended "XML Schema" as a schema definition language to replace DTD.In this volume, we will be looking both at writing XML documents simply according to XML syntax (well-formed XML documents), as well as writing XML documents to be used as business-to-business data, or in other words, a data format to be shared between and among different companies.

Index In previous volumes, we discussed well-formed XML documents, valid XML documents using DTDs, and XML parsers.The easier solution, and the one discussed in this article, is to create an instance of the XML document, then use schema production tools to generate a schema that is valid for that instance.In this case, the more complete the instance is to your final requirements, the more the tools can do to build the schema from it.Seiichi Kinugasa In this and the next two volumes, we will discuss "XML Schema," a common schema definition language.Mainly we will address the differences between DTD and XML Schema definitions discussed in earlier volumes, and element and attribute declarations using XML Schema.XML documents are used for many different purposes today.

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