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CHAPTER 2 TAKING A CRASH COURSE IN XML
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minOccurs="0" maxOccurs="1" /> <xs:element name="Properties" type="FeaturePropertyDefinitions" minOccurs="0" maxOccurs="1" /> <xs:element name="ActivationDependencies" minOccurs="0" maxOccurs="1" type="FeatureActivationDependencyDefinitions" /> </xs:all> <xs:attribute name="Id" type="UniqueIdentifier" use="required" /> <xs:attribute name="Title" type="LocalizableString" /> <xs:attribute name="Description" type="LocalizableString" /> <xs:attribute name="Version" type="FeatureVersion" /> <xs:attribute name="Scope" type="FeatureScope" use="required" /> <xs:attribute name="ReceiverAssembly" type="AssemblyStrongName" /> <xs:attribute name="ReceiverClass" type="AssemblyClass" /> (snipped for the sake of brevity) Each of these attributes and child elements constitutes the schema we need to validate that our feature adheres to the specification. The outer element xs:ComplexType means we have a type that comprises other attributes and elements. You can also see the xs:all element, which says that we can include all child elements within the xs:all element. Each of the child elements inside this xs:all element has a minOccurs attribute and a maxOccurs attribute. Although not required, these attributes define how many times a child element can occur. For the three child elements here, we can have zero or one occurrence of the element, meaning they are all optional but cannot be included more than once. Note also that each of the child elements has a different type, defined elsewhere in the wss.xsd file. Feel free to look them up to see more examples of how XSD works. Next we have a set of xs:attribute elements, and, you guessed it, these list which attributes are allowed in the Feature element. If you are using an XML editor, you can connect your XML document, such as your feature.xml file, to the schema document wss.xsd to get IntelliSense support. I explained how to set this up using Visual Studio in 1.
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There is a wonderful XSD tutorial at http://www.w3schools.com/schema/ that explains far more Tip
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details than I can fit here.
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So, what if you want to lead the CAML to the water and make it drink CAML is what I referred to earlier as an XML dialect. Dialects are implementations of XML and, simply put, are just a set of references and schemas to define how to create an XML document that will be used in a certain fashion. But there is more to CAML than just XML documents.
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CHAPTER 2 TAKING A CRASH COURSE IN XML
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The truth is, any use of the start-tag/end-tag notation that adheres to the XML syntax rules can be considered XML. The implementation is not just limited to XML documents. In SharePoint, for instance, you would use a CAML string to retrieve data from an SPQuery object: SPQuery query = new SPQuery(); query.Query = @"<Where><Eq><FieldRef Name='Title'/><Value Type='Text'> My title</Value></Eq></Where>"; SPListItemCollection items = list.GetItems(query); Even though there is no XML declaration, this is XML all the same. This means you have the best of both worlds. First you have the rigidity and strong typing of an XML document, supported by a good editor. Then you can pull only the parts you need when you use XML in other forms, such as in a CAML query in an SPQuery object. Of course, this can be a bit cumbersome. Writing the CAML by hand without validation tool support can be a nasty experience, especially for more complex queries. This is where tools come into play. Normally I do not recommend any particular tools, because I think you should find the tools you like and learn them. However, since authoring CAML can be frustrating, I ll mention a few of these tools now that we are in the desert. (Get it Desert Lots of CAMLs Oh, I crack myself up.)
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Note We will dive into CAML details throughout the book. And I mean deep dive. Think scuba gear.
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CAML.net
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I don t believe I am alone when I say that I hate writing HTML code by hand. Writing XML is even worse, especially if you have no IntelliSense to help you get things right. Unless you have Forrest Gump tendencies, you will have serious problems keeping track of all the elements, nesting tags, syntax, and field type references. Doing so inside a string is likely to make your head implode. The first tool I want to mention is John Holiday s CAML.net. CAML.net is a free tool available from CodePlex. You can download it at http://www.codeplex.com/camldotnet. Feel free to mention Mr. Holiday in your prayers for his wonderful contribution to your CAML authoring sanity. What this tool does is let me rephrase that a bit. CAML.net is an assembly a DLL, nothing less that you reference in your project. When you do, you get to use the wonderful class
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