TAKING A CRASH COURSE IN XML in Font

Create DataMatrix in Font TAKING A CRASH COURSE IN XML

CHAPTER 2 TAKING A CRASH COURSE IN XML
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<author> <a:name xmlns:a="http://understandingsharepoint.com/userexperience/author"> Bj rn Christoffer Thorsm hlum Furuknap </a:name> </author> </book>
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There is a problem, though. What happens if you want to store other markup, such as HTML, inside an XML document You could translate the markup < and > into < and >, respectively, before you store the data, but that gets you only part of the way. What about storing a binary file over which you have no control A C# method function might contain < and > as comparison operators. Consider the following C# method that you might want to store: <Method Name="IsInRange"> public bool IsInRange(int min, int max, int value) { if (value < max && value > min) { return true; } else { return false; } } </Method> Storing the method in an XML document will lead the XML parser to recognize an XML start tag, <max && min>, which is neither valid XML nor has a matching end tag. The result is that the parser will croak. The solution comes in the form of a strangely formatted element called CDATA, short for character data. What the CDATA element does is turn off parsing of content as XML. The format of the CDATA element is as such: <![CDATA[content]]> in which content is what should not be parsed as XML. You can add line breaks, more XML, other markup, binary data, or generally whatever you like, as long as it does not contain the sequence ]]>. To store your C# method, you would do something like this: <Method Name="IsInRange"> <![CDATA[ public bool IsInRange(int min, int max, int value) { if (value < max && value > min)
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CHAPTER 2 TAKING A CRASH COURSE IN XML
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{ return true; } else { return false; } } ]]> </Method> You may actually find yourself in the position where you need to store ]]> as part of the CDATA element. What if you wanted to store the entire Method element shown previously inside another XML element, for instance, to show as an example in a book To store a CDATA element inside another CDATA element, you should just split the final ]]> sequence into two CDATA elements, right before the final >: <Example> <![CDATA[ <Method Name="IsInRange"> <![CDATA[ public bool IsInRange(int min, int max, int value) { if (value < max && value > min) { return true; } else { return false; } } ]]]]><![CDATA[>]]> </Method> </Example> The magic happens in the line ]]]]><![CDATA[>]]>. If you break it down, you will see that the first two characters, ]], are the beginning of the end of the inner CDATA element. Then you finish the first and outer CDATA element with the ]]> sequence before you start a completely new CDATA element to hold the final > of the inner CDATA element. Voil ! You have a valid XML element containing another CDATA element. You might also have a headache. Despite all these syntax rules and possibilities, you still have no way of knowing what you should put into the XML document. For that we turn to
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CHAPTER 2 TAKING A CRASH COURSE IN XML
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There is a difference between having a well-formed XML document and having a valid XML document. This relates to the issue of the XML schema. A schema defines how an XML document should be built no, not which program is used to create the file but what it contains. There are two competing standards for defining an XML document schema, DTD and XSD. As I mentioned earlier, I won t be covering DTDs in this book. Simply put, I find DTDs to be more restrictive, and not in the good way, and less powerful than XSD. Also, since SharePoint uses XSD for the CAML schema, focus should be on XSD.
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