auto generate barcode vb net MAKING CHOICES in Software

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MAKING CHOICES
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In the preceding example you de ned three child elements that were required to occur in a speci c sequence. Now you want to allow the author a choice between three elements. The DTD equivalent is
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targetNamespace="http://www.lanw.com/namespaces/ song"> <element name="song"> <complexType> <all> <element ref="song:title"/> <element ref="song:artist"/> <element ref="song:fileSize"/> </all> </complexType> </element> <element name="title" type="string"/> <element name="artist" type="string"/> <element name="fileSize" type="string"/> </schema> Because the minOccurs and maxOccurs attributes are not used, the default value is assumed, and therefore, the document author is required to use each child element once. However, the order is up to the document author. There are no unique attributes for this element.
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In this section you look at several of these options rolled into one example: <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> <choice> <element ref="song:title"/> <element ref="song:artist"/> </choice> <element ref="song:fileSize"/> </sequence> </complexType> </element> <element name="title" type="string"/> <element name="artist" type="string"/> <element name="fileSize" type="string"/> </schema> In this example you rst use the sequence element to de ne the order in which the elements must occur. Next, you use the choice element to de ne a choice for the rst child element. After the closing choice tag, you de ne the last child element.
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You should come up with something similar to the following document: <song xmlns="http://www.lanw.com/namespaces/song"> <title>text of title</title> <fileSize>text of fileSize</fileSize> </song> Or <song xmlns="http://www.lanw.com/namespaces/song"> <artist>text of artist</artist> <fileSize>text of fileSize</fileSize> </song> There are only two options for our document. First, both options require that the song element is the root element. Next, you know that the song element must have only two child elements. For the rst child element, you have a choice: title or artist. For the next child element, you must use leSize. Because you don t use the minOccurs or maxOccurs attribute for any of the de nitions or declarations, you can only use each element once.
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3.3.2 DECLARING ATTRIBUTES
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Declaring attributes is much like declaring elements. For attribute declarations, you use the attribute element. Suppose that you want to add a genre attribute to the song element. The DTD syntax would be as follows: <!ELEMENT song (title, artist, fileSize)> <!ATTLIST song genre CDATA #REQUIRED> Now take a look at the XML Schema equivalent: <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> <attribute name="genre" type="string" use="required"/> </complexType> </element> <element name="title" type="string"/> <element name="artist" type="string"/>
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CHAPTER 3 Schemas
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> <attribute name="genre" type="string" use="default" value="unknown"/> <attribute name="href" type="uriReference" use="required"/> </complexType> </element> <element name="title" type="string"/> <element name="artist" type="string"/> <element name="fileSize" type="string"/> </schema> Our new addition is a required attribute named href and can accept a uriReference datatype. The uriReference and string datatypes are the only two datatypes that we discuss; however, there are several to choose from, and you can create your own. All of this is covered in the following section.
Schema for Datatypes
NOTATION, ENTITY,
One of the main drawbacks to using DTDs is that they do not allow for sophisticated datatyping. Take a second to refresh your memory:  Attribute datatypes: ID, IDREF(S), CDATA, ENTITIES, NMTOKEN(S), and enumerated values  Element datatypes: PCDATA and/or child elements
And that is it. One of the reasons schemas have become so attractive is that they allow for more sophisticated datatyping. Wouldn t it be nice to require the ISBN number to contain exactly 10 digits When it comes time to validate your documents, you can be sure that there are no entry mistakes. What about dates Would it be helpful to de ne a naming convention for dates XML Schema datatyping is de ned by the XML Schema Part 2: Datatypes document. Take a second to look at a DTD fragment: <!ATTLIST book price CDATA #IMPLIED> With this declaration, you, as the document author, are free to use any character data string as the value; for example, the following would be valid:
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