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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 datatype. You can see a list of acceptable datatypes in Appendix A.
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XML Support in SQL Server 2000
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The following listing shows an XML document that complies with the previous 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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Let s review schema attributes that can be used to declare elements and attributes. These can be classified as
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Element constraints Attribute constraints XML datatypes Group constraints
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Element Constraints Elements in a schema can be constrained using attributes of the <ElementType> tag:
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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 12-1.
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Content
Meaning
textOnly eltOnly empty mixed Table 12-1.
Only text is allowed as content Only other elements are allowed as content No content Both text and elements are allowed
Content Attribute Values
An important innovation in XML 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 closed . It is also possible to define how many times a subelement can appear in its parent element 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 12-2). The default value for order is seq when the content attribute is set to eltOnly and 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.
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Order
Meaning
seq one many
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 Attribute Values of ElementType
Table 12-2.
The required attribute (constraint) in a schema specifies that the attribute is mandatory in XML documents that follow the schema. The default attribute (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 Datatypes The schema can also enforce the datatype of the attribute or element. Table A-2 in Appendix A lists datatypes and their meanings, and Table A-3 in Appendix A maps XML datatypes to SQL Server datatypes. 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"
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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.
XML Namespaces
Some entities from different areas of a document can have the same name. For example, you could receive a purchase order document that contains a <name> tag for the customer and a <name> tag for the reseller company. People reading this document would be able to distinguish them by their context. However, an application would need additional information to correctly interpret the data. An answer to this problem is to create XML namespaces to provide the XML document with a vocabulary (that is, a context). After that, customer and company names can be referenced using a context prefix:
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