SQL Server 2000 Stored Procedure & XML Programming in .NET

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SQL Server 2000 Stored Procedure & XML Programming
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<xsd:unique name="DocumentKey1" msdata:PrimaryKey="true"> <xsd:selector xpath=".//mstns:Equipment" /> <xsd:field xpath="mstns:EquipmentId" /> </xsd:unique> </xsd:element> </xsd:schema>
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You may notice that all elements in all XML Schema documents have an xsd prefix. Therefore, they are often stored in .xsd files and referred to as XSD schemas. An XSD schema defines the structure and the types of data that can be used in a valid XML document instance. The following XML document is a valid instance of the previous schema:
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< xml version="1.0" encoding="utf-8" > <Document xmlns="http://www.trigonblue.com/Equipment.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="Equipment.xsd"> <Equipment> <EquipmentId>478</EquipmentId> <Make>Compaq</Make> <Model>15 Cart. DLT Library Tabletop Conversion Kit </Model> <EqTypeId>1</EqTypeId> </Equipment> <Equipment> <EquipmentId>394</EquipmentId> <Make>Compaq</Make> <Model>2KVA Prestige W/Ext full Bat</Model> <EqTypeId>1</EqTypeId> </Equipment> <Equipment> <EquipmentId>347</EquipmentId> <Make>Compaq</Make> <Model>Deskpro EN CMT PIII 733 10GB 128MB 48xCD nVidia NT</Model> <EqTypeId>1</EqTypeId> </Equipment> ... </Document>
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When an instance of an XML document and an XSD schema are processed together in a schema validator, the program checks whether the instance complies with the business rules defined in the schema and reports the result to the caller.
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13: Introduction to XML for Database Developers
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xsd:schema Element
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All XML Schema documents must contain the xsd:schema root element:
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<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.trigonblue.com/Equipment.xsd" xmlns="http://www.trigonblue.com/Equipment.xsd" xmlns:mstns="http://www.trigonblue.com/Equipment.xsd" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" elementFormDefault="qualified" attributeFormDefault="qualified"> ... </xsd:schema>
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The xmlns:xsd attribute notifies a parser (or any other agent) that all elements with an xsd prefix should be processed as XSD schemas. You must be very careful to include a reference to the namespace using the URL indicated in the preceding listing. Otherwise, parsers and validators will not recognize it and will not be able to process the XSD schema properly. All components of an XSD schema (such as elements, types, sequence, schema) are defined in this namespace. The targetNamespace attribute specifies the namespace of a target XML document instance. The XML document instance must have a matching namespace declaration. The xmlns attribute defines the default name of the namespace in the XML document instance. When you set elementFormDefault and attributeFormDefault to qualified, all elements and attributes defined in the XSD schema (not just global elements and attributes) will belong to the target namespace in the XML document instance, and they must be namespace qualified (that is, they must contain the appropriate prefix).
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Structure Declarations and Definitions
The primary tasks of the developer (or program) writing an XSD schema are to Declare the components of an XML document instance (elements and attributes) Define the components that are used inside the XSD schema (such as simple and complex types and attribute and model groups)
SQL Server 2000 Stored Procedure & XML Programming
Element and Attribute Declaration
xsd:element and xsd:attribute are used to declare elements and attributes in an XML document instance. In their simplest forms, elements and attributes can be defined by name and type (data type). In the following case, the LocationId attribute is defined as int and the Location element is defined as string:
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <xsd:element name="Location" type="xsd:string"/> <xsd:attribute name="LocationId" type="xsd:int"/> </xsd:schema>
Attributes can be declared based only on simple types, while elements can be declared based on both simple and complex types (I will define types in the next two sections). Attributes and elements can be defined either globally (just below xsd:schema), as in the previous example, or inside other elements and complex types.
Simple Type Declarations
Types are XSD schema equivalents of data types. Simple types are XSD components that cannot contain xsd:elements and xsd:attributes. Some simple types like int, datetime, string, ID, IDREF, language, and gYear (Gregorian year) are defined along with the XML Schema in the xsd namespace, while others can be derived from them in the XSD schema (like user-defined data types in TSQL). A new simple type is derived in an xsd:simpleType element:
<xsd:simpleType name="ProdYear"> <xsd:restriction base="xsd:gYear"> <xsd:minInclusive value="1990"/> <xsd:maxInclusive value="2010"/> </xsd:restriction> </xsd:simpleType>
A new simple type is defined by a name (attribute) and a set of facets (elements) inside the xsd:restriction element. In this case, the minInclusive and maxInclusive facets define the range of acceptable years. The enumeration facet can be used to define a lookup list (the list of acceptable values):
<xsd:simpleType name="CanProvince"> <xsd:restriction base="xsd:string"> <xsd:enumeration value="ON"/>
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