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Entity references are often used to represent characters with special meaning in XML. In the following example, entity references are used to prevent the XML parser from parsing the content of the <Text> tag:
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<Example> <Text> <Inventory Inventoryid="12"/> </Text> </Example>
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XML Documents consists of the three parts that you can see in the following illustration:
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The first part of the document is called the prolog or document type declaration (not Document Type Definition). It is not required. It can contain processing instructions, a DTD, and comments. The body of the document contains the document s elements. The data in these
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elements is organized into a hierarchy of elements, their attributes, and their content. Sometimes an XML document contains an epilog, an optional part that can hold final comments, or processing instructions, or just white space.
XML Document Quality
There are two levels of document quality in XML:
Well-formed documents Valid documents
An XML document is said to be a well-formed document when
w s s s v
There is one and only one root element. All elements that are not empty are marked with start and end tags. The order of the elements is hierarchical; that is, an element A that starts within an element B also ends within element B. Attributes do not occur twice in one element. All entities used have been declared.
An XML document is said to be a valid document when
The XML document is well-formed. The XML document complies with a specified DTD document.
The concept of a valid document has been imported to XML from SGML. In SGML all documents must be valid. XML is not so strict. It is possible to use an XML document even without a DTD document. If the user agent knows how to use the XML document without the DTD, then the DTD need not even be sent over the Net. It just increases traffic and ties up bandwidth.
12:
XML Support in SQL Server 2000
XML Schema
DTD is not the only type of document that can store rules for an XML document. Several companies (including Microsoft) have submitted a proposal to W3C for an alternative type of metadata document called an XML schema. In fact, there are other proposed standards for the same use, which are all referred to as XML schemas. These are the major differences between a DTD and an XML schema:
XML schemas support datatypes and range constraints. The language in which XML schemas are written is XML. Developers do not have to read an additional language as they do with DTDs. XML schemas support namespaces (XML entities for defining context).
XML Data Reduced (XDR)
At the time of this writing, the W3C had not yet adopted the XML schema as a standard. Microsoft has implemented a variation of XML schema syntax called XML Data Reduced (XDR) in the MSXML parser that is delivered as a part of Internet Explorer 5. Microsoft has promised complete support for the XML schema when the W3C awards it Recommended status, but for the time being, more and more tools and organizations are using XML Data Reduced. It is also important to note that Microsoft uses XDR in BizTalk, one of the most important initiatives in the Web application market. It is an initiative intended to create e-commerce vocabularies for different vertical markets. SQL Server 2000 also uses XDR for its XML schema. Let s review an example of an XML schema document:
<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"/>
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<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>
This schema describes the structure of an XML document that contains Inventory information. The schema describes just one element. It is defined in the <ElementType> tag. The definition also specifies its name ( Inventory ), content (the tag is empty because all information will be carried in attributes), and content model ( closed it is not possible to add elements that are not specified in the schema). The element contains multiple attributes. Each attribute is first defined in an <AttributeType> tag and then instantiated in an <attribute> tag:
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