c# create 2d barcode Note Having an empty element such as <tag/> may seem pointless, but consider how you would store in Font

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Note Having an empty element such as <tag/> may seem pointless, but consider how you would store
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NULL data in your file, and it may make more sense.
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You can also have multiple and similar child elements in a tag: <element> <childtag>child data 1</childtag> <childtag>child data 2</childtag> <childtag>child data n</childtag> </element>
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CHAPTER 2 TAKING A CRASH COURSE IN XML
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You can use attributes, described later in the chapter, to identify each child element uniquely. Having unnumbered tags such as the previous example does have its advantages, however. Consider a simple document stored as XML: <book> <chapter> <heading> 1</heading> <paragraph>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</paragraph> <paragraph>Maecenas porttitor congue massa.</paragraph> <illustration> <file>illustration1.tif</file> <caption>Illustration 1</caption> </illustration> <paragraph>Fusce posuere, magna sed pulvinar ultricies, purus lectus </paragraph> </chapter> </book> If only books were that simple....
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XML Declarations
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XML also requires, or at least strongly encourages, you to declare the version of the XML standard. This should be considered mandatory and should be the first element in your document: < xml version="1.0" > In addition, the xml declaration may contain information about encoding and whether or not this document uses an external Document Type Definition (DTD): < xml version="1.0" encoding="UTF-8" standalone="no" >
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Note DTDs are not covered in this chapter, but we will explore a more powerful alternative for XML validation, the XML Schema language (known as XSD). The reason why DTDs are not covered is that XSD is used by SharePoint to validate files. XSD is also more developer friendly and is based on XML, while DTD uses a more obscure syntax that requires a lot more explaining. This is a crash course focused on SharePoint, remember I m not aiming to make an XML guru out of you, at least not in this book.
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This declaration must be placed on the first line and at the first character of your document (in other words, no blank spaces or lines should appear before the declaration). The declaration is referred to as the XML declaration.
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CHAPTER 2 TAKING A CRASH COURSE IN XML
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Here is an example of a complete and well-formed XML document, meaning the document follows the correct XML syntax and will be read correctly by any XML interpreter: < xml version="1.0" > <element> <childelement></childelement> </element>
Attributes
In addition to data, your elements can contain attributes. Attributes are often used to configure your element, but you can use attributes to store data as well. Attributes are added inside your start tag and contain an attribute name and value pair: <element attributename="value"></element> You can have multiple attributes as well; just make sure you always enclose the values with quotes (""): <element attribute1="value1" attribute2="value2"/> As with element names, attribute names are case sensitive. In other words, the following two elements are not the same: <element Attribute1="value1" Attribute2="value2"></element> <element attribute1="value1" attribute2="value2"></element> Although this may or may not be valid XML depending on the schema, Attribute1 and attribute1 are not the same attribute.
Namespaces
Namespaces in XML ensure that multiple element names are not in conflict. If you have multiple elements with the same name but different meanings, you couldn t validate the XML document without some way to separate the similar elements. Take a look at this example: <book> <author> <name>Bj rn Christoffer Thorsm hlum Furuknap</name> <title>Senior Solutions Architect</title> </author> <chapter number="1"> <title>Checking Your Gear for Departure</title> </chapter> </book> Notice the two title elements. Having two title tags presents a problem in addressing the right title tag. You can solve this problem by prefixing elements that belong to a certain data group. Take a look at this improved example:
CHAPTER 2 TAKING A CRASH COURSE IN XML
<book> <author> <a:name>Bj rn Christoffer Thorsm hlum Furuknap</a:name> <a:title>Senior Solutions Architect</a:title> </author> <chapter number="1"> <c:title>Checking Your Gear for Departure</c:title> </chapter> </book> Now, rather than just having title as the element name, you have a:title for the author title and c:title as the chapter title. Each of the prefixes a and c is tied to a namespace. The good thing is that it s simple to define these namespaces and the connected prefix. To get a namespace and tie it to a prefix, you add an attribute to the element or an ancestor element where you intend to use the prefix: <book xmlns:a="http://understandingsharepoint.com/userexperience/author" xmlns:c="http://understandingsharepoint.com/userexperience/chapter"> </book> The format of the namespace declaration is quite simple but can be confusing, especially since there seems to be a URL in there. The first part, xmlns, is just to say that this is a namespace declaration. The second part, separated from xml by a colon, states which prefix you will be using. The third part is the name of the namespace and has nothing to do with the web address it resembles. You might as well have written this: <book xmlns:a="http://Randomtext.com/Author" xmlns:c="http://ThisIsAnotherRandomText.com/"> </book> As long as the namespace name is a URI (or an empty string, which rarely makes sense), you should be OK. You can add the namespace declaration to any element that is an ancestor to the element using the namespace, but you can even define the namespace on the element itself. All the following are valid declarations of namespaces for the a prefix: <book xmlns:a="http://understandingsharepoint.com/userexperience/author"> <author><a:name>Bj rn Christoffer Thorsm hlum Furuknap</a:name></author> </book> <book> <author xmlns:a="http://understandingsharepoint.com/userexperience/author"> <a:name>Bj rn Christoffer Thorsm hlum Furuknap</a:name> </author> </book> <book>
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