<ElementType name="ROOT" sql:is-constant="1"> <element type="Inventory"/> </ElementType> in VS .NET

Creating Data Matrix in VS .NET <ElementType name="ROOT" sql:is-constant="1"> <element type="Inventory"/> </ElementType>

<ElementType name="ROOT" sql:is-constant="1"> <element type="Inventory"/> </ElementType>
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You can see the complete tree of the XML document by using the following URL:
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http://localhost/asset/Schema/InvSchema.xml/ROOT
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The XPath query refers to the <ROOT> node and all nodes that it contains. The result is shown in Figure 14-22.
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SQL Server 2000 Stored Procedure & XML Programming
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Figure 14-22
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Using a URL with an XDR schema and an XPath query
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You could use XPath to further filter the result. The following URL retrieves only Inventory nodes that have a StatusId attribute set to 2:
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http://localhost/asset/Schema/InvSchema.xml/ROOT/Inventory[@StatusId=2]
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The result is shown in Figure 14-23.
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XML Views Based on Annotated XSD Schemas
Since the W3C gave the XML Schema Recommended status in May of 2001, Microsoft has been adding support for XSD schemas in SQL Server 2000. If you install SQLXML on your server, you will be able to create XML views using XSD annotated schemas.
14: Publishing Information Using SQLXML
Figure 14-23
Filtering XML documents using an XPath query
NOTE
If you have already made an investment to develop a number of XDR schemas (for example, on a BizTalk project), you can convert them to XSD schemas. SQLXML 3.0 (and newer versions) includes the CvtSchema.exe tool in the \Program Files\SQLXML 3.0\bin folder, which enables you to convert the XDR schemas to XSD schemas.
I will now delve into the design details of XSD annotated schemas. You will see that they are not much different from XDR annotated schemas.
Required Namespaces
XSD schemas are defined in the http://www.w3.org/2001/XMLSchema namespace. SQL Server annotations are defined in the urn:schemasmicrosoft-com:mapping-schema namespace. If an XSD schema also specifies SQL Server data types, it must contain a reference to the
SQL Server 2000 Stored Procedure & XML Programming
urn:schemas-microsoft-com:datatypes namespace. Therefore, a typical XSD schema will have a root element similar to the following:
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:dt="urn:schemas-microsoft-com:datatypes" xmlns:sql="urn:schemas-microsoft-com:mapping-schema"> ... </xsd:schema>
Mapping Tables, Views, and Columns
In the case in which an element is named differently than a table (or a view), you must add a sql:relation annotation (as an attribute of the xsd:element element) to the schema. Its value must match the table (or the view) name. In the case in which attributes or elements are named differently than the columns of the table (or the view), you must add a sql:field annotation to the schema. In the following example, the Equipment table is mapped to the element Part and the columns EquipmentId and Make are mapped to the attributes PartNum and Manufacturer:
< xml version="1.0" encoding="UTF-8" standalone="no" > <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:dt="urn:schemas-microsoft-com:datatypes" xmlns:sql="urn:schemas-microsoft-com:mapping-schema"> <xsd:element name="Part" sql:relation="Equipment" type="Part_type" /> <xsd:complexType name="Part_type"> <xsd:all> <xsd:element name="PartNo" sql:field="EquipmentId" type="xsd:int" /> <xsd:element name="Manufacturer" sql:field="Make" type="xsd:string" /> <xsd:element name="Model" type="xsd:string" /> </xsd:all> </xsd:complexType> <xsd:element name="PartNo" sql:field="PartNo" type="xsd:int" /> <xsd:element name="Manufacturer" sql:field="Make" type="xsd:string" /> <xsd:element name="Model" type="xsd:string" /> </xsd:schema>
The name of the Model element is the same as the name of the database field, so there is no need to include annotations to link them. SQL Server will use default mapping to automatically link XML and SQL Server components.
Mapping Relationships
XSD schemas can map to more than one table. As previously discussed, table relationships are annotated using the sql:relationship element. This tag must be contained within the xsd:appinfo element inside the xsd:annotation
14: Publishing Information Using SQLXML
element. In XSD Schemas, the sql:relationship element has four attributes that link elements in a manner similar to the creation of foreign keys between tables in relational databases: Attribute
parent parent-key child child-key
Description
Name of the primary relation Node (field) in a primary relation (table) that serves as the primary key Name of the foreign relation (table) Node (field) in a foreign relation (table) that serves as the foreign key
The following schema contains the definition for a relationship between the Contact and Inventory elements:
< xml version="1.0" encoding="UTF-8" standalone="no" > <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:dt="urn:schemas-microsoft-com:datatypes" xmlns:sql="urn:schemas-microsoft-com:mapping-schema"> <xsd:element name="Contact" sql:relation="Contact" type="Contact_type" /> <xsd:complexType name="Contact_type"> <xsd:all> <xsd:element name="Inventory" sql:relation="Inventory" type="Inventory_type"> <xsd:annotation> <xsd:appinfo> <sql:relationship parent="Contact" parent-key="ContactId" child="Inventory" child-key="OwnerId" /> </xsd:appinfo> </xsd:annotation> </xsd:element> </xsd:all> <xsd:attribute name="ContactId" type="xsd:int" /> <xsd:attribute name="FirstName" type="xsd:string" /> <xsd:attribute name="LastName" type="xsd:string" /> <xsd:attribute name="Phone" type="xsd:string" /> <xsd:attribute name="Fax" type="xsd:string" /> <xsd:attribute name="Email" type="xsd:string" />
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