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XML Schema also allows you to overload a user-defined data type, allowing it to take on one of several different underlying data types depending on the specific need. For example, in the preceding custAddrType definition, the postal code portion of the address is defined as an integer. This works for US-style five-digit zip codes (except that it doesn t preserve the leading zero), but not for Canadian six-digit postal codes, which include letters and digits. A more international approach is to declare the U.S. and Canadian versions, and then a more universal postal code, which may be any of the types:
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<simpleType name="usZip5Type"> <restriction base="integer"> <totalDigits value=5 />
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</restriction> </simpleType> <simpleType name="canPost6Type"> <restriction base="string"> <length value=6 /> </restriction> </simpleType> <simpleType name="intlPostType"> <union memberTypes="usZip5Type canPost6Type" /> </simpleType>
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With user-defined data type definitions in place, you can more easily define larger, more complex structures. For example, here is part of the purchase order document in Figure 25-7, expanded to include a bill-to and ship-to address, and to permit a list of sales representatives:
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<complexType name="purchaseOrderType"> other element declarations go here <element name="billAddr" type="custAddrType" /> <element name="shipAddr" type="custAddrType" /> <element name="repNums" type="repListType" /> other element declarations continue
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Building on its support for a rich data type structure, XML Schema also provides a rich vocabulary for specifying the legal structure of a document type and the permitted elements and attributes that comprise it. XML Schema supports the same basic element types defined in the DTD model: I Simple content. The element contains only text content (although as explained in the preceding section, the text can be restricted to data of a specific type like a date or a numeric value). Content of this type is defined using a simpleContent element. I Element-only content. The element contains only subelements. Content of this type is defined using a complexType element. I Mixed content. The element contains a mix of subelements and its own text content. Unlike the DTD mixed-content model, XML Schema requires that the sequence of elements and text content be rigidly defined, and valid documents must conform to the defined sequence. Content of this type is defined using a mixed attribute on a complexType element.
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I Empty content. The element contains only attributes, and no text content of its own. XML Schema treats this as a special case of element-only content, with no declared elements. I Any content. The element contains any mix of content and subelements, in any order. Content of this type is defined using the XML Schema data type anyType as the data type of the element. These basic element types can appear individually in the declarations of elements within a schema. You can also specify that an element may occur multiple times within a document, and optionally, specify a minimum and a maximum number of occurrences. XML Schema also supports SQL-style NULL values for elements, to indicate that element contents are unknown. The XML terminology is nil values, but the concept is the same. This capability simplifies mapping of data between XML document elements and database columns that can contain NULL values. XML Schema lets you define a logical group of elements that are typically used together, and give the element group a name. Subsequent element declarations can then include the entire named group of elements as a unit. Grouped elements also provide additional flexibility for element structure. The group can specify a sequence of elements, which must all be present, in the specified order. Alternatively, it can specify a choice of elements, indicating that only one of a set of defined element types must appear. XML Schema provides similar control over attributes. You can specify an individual attribute as optional or required. You can specify a default attribute value, to be used if an explicit value is not provided in the document instance, or a fixed attribute value, which forces the attribute to always have the specified value in an instance document. Attribute groups allow you to define and name a group of attributes that are typically used together. The entire group of attributes can be declared for an element in a schema simply by naming the attribute group. Finally, XML Schema provides extensive support for XML namespaces, which are used to store and manage different XML vocabularies that is, different collections of data type definitions and data structure declarations that are used for different purposes. In a large organization, it will be useful to define standardized XML representations for common basic business objects, such as an address, a product number, or a customer-id, and collect these in a common repository. Higher-level XML declarations for documents such as purchase orders, vacation time requests, payment authorization forms, and the like will also be useful, but should typically be collected together in groups based on shared usage. XML namespaces support these capabilities by allowing you to collect together related XML definitions and declarations, store them in a file, and identify them by name. An XML schema for a new type of document can then draw its basic data definitions and structures from one or more namespaces by referencing the namespaces in the schema header. In fact, the standard XML vocabulary and many of the built-in data
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