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Note For a complete list of base types and available facets, see the W3C XML Schema Part 0: Primer
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document at http://www.w3.org/TR/xmlschema-0.
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Try It Out: Use a Regular Expression Pattern By far, the most powerful facet is pattern, which allows you to specify a regular expression that must be matched by the value in order to be valid. In the case of the KeyDef type you defined, you know the exact format for a GUID string: it s composed of five sections of mixed characters (either uppercase or lowercase) and digits, in groups of 8-4-4-4-12 characters, as in C9796AD1-5A7E-4d9c-9F99-0090E11E5662. 1. Add a new facet row to the KeyDef simple type definition. 2. Specify that the facet is of type pattern. Set its value to the following regular expression, which defines the format of a GUID string: ^[a-fA-F\d]{8}-([a-fA-F\d]{4}-){3}[a-fA-F\d]{12}$
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How It Works If you switch to the XML view again, the new facet will look like the following in the XML source: <xs:simpleType name="KeyDef"> <xs:restriction base="xs:string"> <xs:length value="36" /> <xs:pattern value="^[a-fA-F\d]{8}-([a-fA-F\d]{4}-){3}[a-fA-F\d]{12}$" /> </xs:restriction> </xs:simpleType> This is the second time you ve encountered regular expressions in this book. You saw them in 3, when we discussed validation controls, and now for XSD simpleType restrictions. By now, you probably realize their importance in data validation. If you look at the XSD code (by clicking the XML button on the bottom-left side of the pane), you ll see that the KeyDef type is defined as a child of the root <xs:schema> element. This means that this type definition is available to all other elements in the document; that is, it s a global type. As we mentioned before, a global type must have a name so that other elements can reference it; it is therefore also a named type.
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CHAPTER 7 MARKUP LANGUAGES AND XML
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It s also possible to define global complex types, which you can reuse in several places in a schema (just as we have done here, by using the KeyDef type definition in the UserID and PlaceID items). Incidentally, this probably helps to explain why an element such as <User>, which is local to the <Friends> element, is described as an unnamed complex type.
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Restricting Element Occurrence
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By default, each element defined by a schema must appear once (and only once) in the instance document. Clearly, this is not appropriate for all cases. In particular, in our example, we want to allow multiple <User> and <Attended> elements in a single XML document. By contrast, some of the fields in our database are optional, and they won t always have values. For instance, the MonthIn and MonthOut fields of the TimeLapse table can be null. You can cater to requirements like these through the minOccurs and maxOccurs attributes of XSD elements, as you ll see now. Try It Out: Set Minimum and Maximum Occurrences We ll use this example to set up the rules we just described: you ll allow multiple instances of the <User> and <Attended> elements and force the presence of the PlaceID and ID attributes. 1. We support uploading multiple users in a single document. However, at least one user should be present, or there would be no purpose in the upload! Select the User element of the Friends element in the designer, and open its Properties browser. Set the maxOccurs property to unbounded. The minOccurs default of 1 is appropriate in this case. 2. Each user may attend any number of courses in a single institution. On the other hand, the user may still be in the middle of a first course (no YearOut yet). So, the Attended element should be optional and allow multiple occurrences. Select the Attended element inside the User element in the designer and open its Properties browser. Set the maxOccurs property to unbounded, and set the minOccurs property to 0. 3. Select the PlaceID attribute of the Friends element. Set its use property to required (which means that this attribute must be set on the <Friends> element of instance documents). You will need this attribute to know which institution is uploading users. 4. Repeat step 3 for the ID attribute of the User element. 5. Select the DateOfBirth element of the User element. Set its minOccurs property to 0. Leave maxOccurs at the default setting. 6. Repeat step 3 for the CellNumber element of the User element. 7. Repeat step 3 for three elements of the Attendee element: MonthIn, MonthOut, and Notes. 8. Save the file.
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