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CHAPTER 3 Schemas
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does not truly represent a namespace. However, XML Schema allows you to de ne the namespace, for example: <schema targetNamespace="http://www.lanw.com/namespace/ enrollment"> . . . </schema> Working with namespaces can be a tricky matter; just remember that you must use the XML Schema namespace, and you can create a target namespace for the resulting XML document.
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Advanced Schema Concepts
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Before we cover element and attribute declarations, you need to be familiar with both complex and simple type declarations.
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3.2.1 COMPLEX TYPE
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An element is de ned as a complex type if it allows for child elements and/or may take attributes. There are two ways to de ne complex types. First, you can create a complex-type de nition that can then be used in an element type declaration. Each complex-type de nition can contain element declarations, element references, and attribute declarations. For example, the following is a complex-type de nition: <complexType name="fullnameType"> <sequence> <element name="firstName" type="string"/> <element name="lastName" type="string"/> </sequence> </complexType> This example creates a complex-type de nition that can be used in various element declarations. For example, now you can create an element named customer that must follow the fullnameType de nition. (In other words, it must always have rstName and lastName child elements.) For example: <element name="customer" type="fullnameType"/> The second way to declare complex types is to de ne them as a part of the declaration itself. In this case, you do not de ne a complex type that you reference later. You use a complex-type de nition directly within the element declaration itself; for example: <element name="customer">
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CHAPTER 3 Schemas
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<element ref="song:title"/> <element ref="song:artist"/> <element ref="song:fileSize"/> </sequence> </complexType> </element> The element element (yes, that s right) declares an element. The name attribute names the element. In this case, the element is named song. The next step is to identify the element as a complexType because it contains other elements. Therefore, the complexType element is added. Now it is time to deal with content models. XML Schema allows you to de ne several di erent types of content models all using di erent schema elements and attributes. For example, most of the following elements (also called compositors) can translate to DTD equivalents:        all. No DTD equivalent. any. Similar to the ANY keyword. choice. Similar to the pipe bar (|) connector. group. No DTD equivalent. sequence. Similar to the comma (,) connector.
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There are a few attributes that can be used to de ne content models as well: minOccurs="value". Similar to the DTD occurrence indicators ( , +, and *). maxOccurs="value". Similar to the DTD occurrence indicators ( , +, and *).
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We look at each of these in this chapter. For our example, we focus on the sequence element. The sequence element de nes an ordered sequence for allowable child elements. For example, the following snippet requires that the child elements appear in order of title, artist, and leSize: <sequence> <element ref="song:title"/> <element ref="song:artist"/> <element ref="song:fileSize"/> </sequence> Next, the child elements are de ned. There are two ways to use the element element: as a de nition and as a reference. In this case it is used as a reference. First, the element references are nested, so you know that they are children of the song element. You know that the element s title, artist, and leSize will be de ned later because the ref attribute references later-de ned element declarations. Now what about that song pre x Well, after you declare an element within the scope of a targetNamespace, you must reference it as part of that name-
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CHAPTER 3 Schemas
space, no matter where you use it. In this case you reference the element as part of the ref attribute, so you must use the namespace pre x. Take a second to look back at the namespace de nitions: <schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:song="http://www.lanw.com/namespaces/song" targetNamespace="http://www.lanw.com/namespaces/ song"> Remember that the rst namespace is the default namespace for schema elements. This means that if you use (or reference) any nonschema elements, they must be de ned with an alternative pre x. The last two namespaces work together. The last one (targetNamespace) de nes a namespace to be associated with all declared elements. This is not an xmlns namespace de nition; this simply states that if these elements are used in a document, they must belong to the de ned namespace. Because of this, the second namespace (xmlns:song) is included to do just that: de ne the appropriate namespace for the elements just in case you need to use them. And indeed you do. So here is what has been covered so far: <schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:song="http://www.lanw.com/namespaces/song" targetNamespace="http://www.lanw.com/namespaces/song"> <element name="song"> <complexType> <sequence> <element ref="song:title"/> <element ref="song:artist"/> <element ref="song:fileSize"/> </sequence> </complexType> </element> <element name="title" type="string"/> <element name="artist" type="string"/> <element name="fileSize" type="string"/> </schema> All that is left is to de ne each child element. Because each element should contain only character data, it is de ned to conform to a string datatype. The name attribute names the element, and the type attribute de nes its datatype. This is where schemas can get interesting because, unlike DTDs, you can de ne datatypes for your elements as well as your attributes.
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