SQL Server 2000 Stored Procedure & XML Programming in .NET framework

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SQL Server 2000 Stored Procedure & XML Programming
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The following listing shows an XML document that complies with the previous XDR schema:
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<Inventory xmlns="x-schema:Schema.xml" Inventoryid="5" EquipmentId="1" LocationId="2" StatusId="1" LeaseId="1" LeaseScheduleId="1" OwnerId="1" Cost="1295.0000" AcquisitionTypeID="1"/>
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Schema Constraints
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This section reviews XDR schema attributes that can be used to declare elements and attributes. These can be classified as Element constraints Attribute constraints XML data types Group constraints
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Element Constraints
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Elements in an XDR schema can be constrained using attributes of the <ElementType> tag: name content model order group minOccurs maxOccurs The name attribute defines the name of the subelement. Possible values for the content attribute are listed in the Table 13-1.
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13: Introduction to XML for Database Developers
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content
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"textOnly" "eltOnly" "empty" "mixed" Table 13-1
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Meaning
Only text is allowed as content Only other elements are allowed as content No content Both text and elements are allowed as content
content Attribute Values
An important innovation in XDR schemas (that was not available in DTDs) is the capability to add nondeclared elements and attributes to an XML document. By default, every element of every XML document has its model attribute set to "open". To prevent the addition of nondeclared elements and attributes, the model attribute has to be set to "closed". It is also possible to define how many times a subelement can appear in its parent element by using the maxOccurs and minOccurs attributes. Positive integer values and "*" (unlimited number) are allowed in the maxOccurs attribute, and "0" and positive integer values are allowed in the minOccurs attribute. The default value for minOccurs is "0". The default value for maxOccurs is "1", except that when the content attribute is "mixed", maxOccurs must be "*". An order attribute specifies the order and quantity of subelements (see Table 13-2). The default value for order is "seq" when the content attribute is set to "eltOnly" and is "many" when the content attribute is set to "mixed".
Attribute Constraints
By their nature, attributes are more constrained than elements. For example, attributes do not have subelements (or subattributes), and it is not possible to have more than one instance of an attribute within the element. The required attribute (constraint) in a schema specifies that the attribute is mandatory in XML documents that follow the schema. The default attribute Meaning
Subelements must appear in the order listed in the schema. Only one of the subelements listed in the schema can appear in the XML document. Any number of subelements can appear in any order.
order
"seq" "one" "many" Table 13-2
order Attribute Values of <ElementType>
SQL Server 2000 Stored Procedure & XML Programming
(constraint) in a schema specifies the default value of the attribute in an XML document (the parser will use that value if an attribute is not present). The schema can be set so that an attribute value is constrained to a set of predefined values:
<AttributeType name="status" dt:type="enumeration" dt:values="open in-process completed" />
XML Data Types
The schema can also enforce the data type of the attribute or element. Table A-2 in the appendix lists data types and their meanings, and Table A-3 in the appendix shows the mapping between XML data types and SQL Server data types.
Group Constraints
The group element allows an author to apply certain constraints to a group of subelements. In the following example, only one price (rent, lease, or cost) can be specified for the Inventory element:
<Schema name="Schema" xmlns="urn:schemas-microsoft-com:xml-data" xmlns:dt="urn:schemas-microsoft-com:datatypes"> <ElementType name="Inventory" content="eltOnly" model="closed" order="many"> <element type="Inventoryid"/> <element type="EquipmentId"/> <element type="LocationId"/> <element type="StatusId"/> <element type="LeaseId"/> <element type="LeaseScheduleId"/> <element type="OwnerId"/> <group order = "one"> <element type="Rent"/> <element type="Lease"/> <element type="Cost"/> </group> <element type="AcquisitionTypeID"/> </ElementType> </Schema>
The group constraint accepts order, minOccurs, and maxOccurs attributes.
13: Introduction to XML for Database Developers
XML Schema (XSD)
In May of 2001, XML Schema was given Recommended status by the W3C. Unfortunately, this stamp of approval happened after Microsoft had already released SQL Server 2000. However, in subsequent web releases of XML for SQL and SQLXML, and in releases of other products such as Visual Studio .NET, Microsoft has added support for XML Schema. You can find the W3C XML Schema Recommendation specification, tools, and other resources at www.w3.org/XML/schema.html. I will try, however, to introduce the most important concepts. The purpose of XML Schema is to define a class of XML documents. Each document of a specified class is an instance of that XML document class. The Equipment.xsd file contains an XML Schema document that defines instances of XML documents with Equipment information:
< xml version="1.0" encoding="utf-8" > <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:element name="Document"> <xsd:complexType> <xsd:choice maxOccurs="unbounded"> <xsd:element name="Equipment"> <xsd:complexType> <xsd:sequence> <xsd:element name="EquipmentId" msdata:ReadOnly="true" msdata:AutoIncrement="true" type="xsd:int" /> <xsd:element name="Make" type="xsd:string" /> <xsd:element name="Model" type="xsd:string" /> <xsd:element name="EqTypeId" type="xsd:short" /> <xsd:element name="ModelSDX" type="xsd:string" /> <xsd:element name="MakeSDX" type="xsd:string" /> </xsd:sequence> </xsd:complexType> </xsd:element> </xsd:choice> </xsd:complexType>
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