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Drawer ANSI/AIM Code 39 in Font MARKUP LANGUAGES AND XML

CHAPTER 7 MARKUP LANGUAGES AND XML
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How It Works When you use the drag-and-drop approach to create a new element, the designer creates a complex type by default. But when you create a new element by typing directly into the designer, the behavior is opposite: it creates a simple type by default. More precisely, this technique creates a string type each time. So, you need to manually change the type of the <Attended> element to Unnamed complexType (that is, a local complex type definition). When you do this (in step 2), VS .NET produces exactly the same <complexType> definition as it generated when you used the drag-and-drop approach: < xml version="1.0" encoding="utf-8" > <xs:schema id="Friends" ...etc... > <xs:element name="Friends"> <xs:complexType> <xs:sequence> <xs:element name="User"> <xs:complexType> <xs:sequence> ...etc... <xs:element name="Attendee"> <xs:complexType> <xs:sequence /> </xs:complexType>
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</xs:element>
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Notice that the nesting inside User is just like that for the User inside Friends. For the child elements of <Attended>, the default behavior is more or less what you want: these elements are all simple types. The other default when adding new rows to an element is that the new item is itself an element. In the final step, you needed to change the Name row, specifying Name as an attribute using the drop-down list.
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Note For a complete list of built-in simple types and their definition, see the W3C XML Schema Part 0:
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Primer document at http://www.w3.org/TR/xmlschema-0.
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CHAPTER 7 MARKUP LANGUAGES AND XML
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Defining Custom Simple Types
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Usually, databases place restrictions on the permitted values for given fields. For example, the SQL Server type called varchar is a string, with a certain maximum length set by the database designer. XSD Schemas also allow you to define such restrictions, by defining custom simple types that modify intrinsic XSD types according to your specific needs. This works by deriving a new type from a base type you select the base type, and then specify the required limitations. In this regard, XSD is similar to the way object-oriented programming languages work: you inherit an existing type and modify its behavior. However, in the case of XSD, you can either extend or restrict a base type, which is different from object-oriented programming, where inheritance is mainly a way to extend types. Try It Out: Define a Custom Simple Type A suitable use of a custom simple type in our example is to restrict valid IDs to strings of exactly 36 characters, which is what our database expects. Let s see how to go about arranging that. 1. From the Toolbox, drop a new simpleType element onto a blank area of the designer surface, and give it the name KeyDef. Note that, by default, the new type derives from the string type, as shown in the right-hand column on the top line. 2. On the blank row below the name and type, click the first column of the row and turn it into a facet, indicated by the capital F. Now open the drop-down list for the second column and select length. Tab to the next column, and enter 36.
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3. Set the ID items in the schema to the newly created simple type. There are two of them to change: the ID attribute on the <User> element and the PlaceID attribute of the <Friends> element. You ll see the new type shown in the drop-down list for the attribute type.
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CHAPTER 7 MARKUP LANGUAGES AND XML
How It Works VS .NET offers a variety of restrictions, which it calls facets, on XSD built-in simple types. The available facets depend on the base type in use, and most are self-explanatory. For the KeyDef type, which is derived from the string simple type, you may have noticed that there were options for length and maxLength. Another useful facet is the enumeration, which allows you to define a list of valid string values.
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