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The DTD is not the only type of document that can store rules for an XML document. At the current time, several companies (including Microsoft) have submitted a
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proposal to W3C for an alternative type of metadata document called the XML Schema. In fact, there are other proposed standards for the same use, which are all referred to as XML schemas. In May of 2001, W3C published its XML Schema Recommendation, which should gradually replace all other XML schemas. However, some of these schemas (such as the one defined by Microsoft) are already in use. XML schemas are XML language for defining the business rules with which a class of XML documents (data) must comply in order to be valid. These are the major differences between a DTD and an XML schema: XML schemas support data types and range constraints. XML schemas allow users to define new data types. The language in which XML schemas are written is XML. Developers do not have to learn an additional language as they do with DTDs. XML schemas support namespaces (XML entities for defining context). Why are XML schemas important A huge portion of application development resources is spent on checking whether data complies with (business) rules about structure and content. If you have a simple language to define the structure and content of data (that is, the business rules by which it is constrained) and you have a schema validator (a tool or program that can check compliance), you will be able to reduce development resource requirements significantly, and therefore reduce the cost to implement applications.
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When SQL Server 2000 was released, the W3C was still working on its XML Schema specification it was not even clear which variation would be adopted. Microsoft has implemented a variation of XML schema syntax called XML Data Reduced (XDR) in the MSXML parser (Microsoft XML Core Services) that was delivered initially as a part of Internet Explorer 5, and later in SQL Server 2000. Microsoft promised complete support for XML Schema when the W3C awarded it Recommended status, but before that could happen, more and more organizations started using XDR. It is also important to note that Microsoft uses XDR in BizTalk, one of the most significant initiatives in the Web Services market. It is an initiative intended to create e-commerce vocabularies for different vertical markets. At the time of this writing, SQL Server 2000 is using XDR schemas for several features, and support for XML Schema is increasing with each SQL Server 2000 Web Release. The following is an example of an XDR schema document:
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13: Introduction to XML for Database Developers
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<Schema name="Schema" xmlns="urn:schemas-microsoft-com:xml-data" xmlns:dt="urn:schemas-microsoft-com:datatypes"> <ElementType name="Inventory" content="empty" model="closed"> <AttributeType name="Inventoryid" dt:type="i4"/> <AttributeType name="EquipmentId" dt:type="i4"/> <AttributeType name="LocationId" dt:type="i4"/> <AttributeType name="StatusId" dt:type="ui1"/> <AttributeType name="LeaseId" dt:type="i4"/> <AttributeType name="LeaseScheduleId" dt:type="i4"/> <AttributeType name="OwnerId" dt:type="i4"/> <AttributeType name="Rent" dt:type="fixed.14.4"/> <AttributeType name="Lease" dt:type="fixed.14.4"/> <AttributeType name="Cost" dt:type="fixed.14.4"/> <AttributeType name="AcquisitionTypeID" dt:type="ui1"/> <attribute type="Inventoryid"/> <attribute type="EquipmentId"/> <attribute type="LocationId"/> <attribute type="StatusId"/> <attribute type="LeaseId"/> <attribute type="LeaseScheduleId"/> <attribute type="OwnerId"/> <attribute type="Rent"/> <attribute type="Lease"/> <attribute type="Cost"/> <attribute type="AcquisitionTypeID"/> </ElementType> </Schema>
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This XDR schema describes the structure of an XML document that contains Inventory information. The schema describes just one element ElementType. The definition also specifies its name ("Inventory"), content (the tag is "empty" because all information will be carried in attributes), and content model ("closed" indicating that it is not possible to add elements that are not specified in the schema). The element contains several attributes. Each attribute is first defined in an AttributeType element and then instantiated in an attribute element:
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<AttributeType name="Cost" dt:type="fixed.14.4"/> ... <attribute type="Cost"/>
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For each attribute, the schema defines a name and a data type. You can see a list of acceptable data types in the appendix at the end of this book.
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