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CHAPTER 8 THE LIQUID NITROGEN OF SHAREPOINT
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Content types can use only site columns, that is, columns that are defined on the site rather than on a list. Each if these site columns have a GUID that is unique to the site, and that GUID is what you use to add a reference to the site column to your content type.
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Note We will examine fields and columns more in the next chapter, so for now this is all you need to
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Take a look at the FieldRefs element of the Document content type excerpted here. Each FieldRef has an ID that points to a field defined somewhere in the site. The fields specified here are parts of the fields feature that gets installed with SharePoint. <FieldRef ID="{5f47e085-2150-41dc-b661-442f3027f552}" Name="SelectFilename" /> <FieldRef ID="{8553196d-ec8d-4564-9861-3dbe931050c8}" Name="FileLeafRef" Required="TRUE"/> <FieldRef ID="{8c06beca-0777-48f7-91c7-6da68bc07b69}" Name="Created" Hidden="TRUE" /> <FieldRef ID="{fa564e0f-0c70-4ab9-b863-0177e6ddd247}" Name="Title" Required="FALSE" ShowInNewForm="FALSE" ShowInEditForm="TRUE"/> <FieldRef ID="{28cf69c5-fa48-462a-b5cd-27b6f9d2bd5f}" Name="Modified" Hidden="TRUE" /> <FieldRef ID="{822c78e3-1ea9-4943-b449-57863ad33ca9}" Name="Modified_x0020_By" Hidden="FALSE"/> <FieldRef ID="{4dd7e525-8d6b-4cb4-9d3e-44ee25f973eb}" Name="Created_x0020_By" Hidden="FALSE" /> You may notice that the Title field is included here. Now, if you have been particularly attentive, you may remember that the Title field is also included in the Item content type, from which Document inherits. By virtue of inheritance, Title should already be included, so why is it added to the Document content type as well The reason is quite simple. FieldRef not only adds references to new columns but also modifies existing columns. If you examine the Title FieldRef from Item, located just above the Document content type in ctypes.xml, you will see that it is different from the Title FieldRef in Document. Here s the Item Title FieldRef: <FieldRef ID="{fa564e0f-0c70-4ab9-b863-0177e6ddd247}" Name="Title" Required="TRUE" ShowInNewForm="TRUE" ShowInEditForm="TRUE"/> Here s the Document Title FieldRef: <FieldRef ID="{fa564e0f-0c70-4ab9-b863-0177e6ddd247}" Name="Title" Required="FALSE" ShowInNewForm="FALSE" ShowInEditForm="TRUE"/>
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CHAPTER 8 THE LIQUID NITROGEN OF SHAREPOINT
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As you can see, the Required attribute is False in Document, because you don t need to title your documents, and the ShowInNewForm is also False, because you only need to upload a file, not give it a title, when you add a new Document to a library. Thus, the Document Title FieldRef is used to modify the behavior and appearance of Title, not to add it. You can override many attributes in this fashion. I will cover fields, columns, and field references in the next chapter.
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If you decide you really do not need a column inherited from a parent, you can use the RemoveFieldRef element to get rid of the parent columns. The documentation is also a bit confusing here, since it lists plenty of attributes such as ReadOnly, ShowInNewForm, and Required, but in fact, none of these attributes is required or even used. The only attribute you need is the ID attribute, and that attribute references the ID of a parent field you want to remove. Maybe the documentation is confusing, but the extra attributes are helpful. Tell me, which field is removed here <RemoveFieldRef ID="{922551b8-c7e0-46a6-b7e3-3cf02917f68a}"/> You may keep a record of all field IDs in your head, but for me, adding an extra attribute saves me some headache: <RemoveFieldRef ID="{922551b8-c7e0-46a6-b7e3-3cf02917f68a}" Name="ImageSize"/>
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Note For some unknown reason, the wss.xsd schema includes a DocumentTemplate entry in the
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FieldRefs element. You may see this when you use IntelliSense to author your content type. You may also
forget the entry is there; it doesn t do anything.
XmlDocuments
The next part of the document ContentType entry is XmlDocuments. Sadly, very little documentation exists on this element. Luckily, that has never stopped a determined developer like you, especially when you realize what the prize is. And it is grand. Let me just make sure you understand this: XmlDocuments, horribly underused in SharePoint custom development, redefines the definition of grand prize. From now on, every other use of the term grand prize should be reduced to great prize not as grand as SharePoint s XmlDocuments. OK, I may be exaggerating a bit, but XmlDocuments can be really cool. What the XmlDocuments element does, or rather, what its children XmlDocument elements do, is store custom information about your content type. You may actually store anything you like; as long as you follow correct XML syntax, you can add your own custom information to use however you see fit. If that does not blow your mind, let me give you a few examples.
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