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Caution Content type ID crafting is a delicate art, so pay attention.
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To investigate content type IDs and inheritance further, start by opening your site content types in your Team Site lab. You will find the site content types on the Site Settings page. On the Site Content Type Gallery page, you should see several out-of-the-box content types. For now, click the Item content type, and look at the URL. You will notice the ManageContentType. aspx file has a parameter ctype=0x01. Yeah, the ctype part is the content type ID.
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You can also hover your mouse pointer over the link to the content type to get the ctype parameter Tip
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in the status bar. Or you can use a tool such as SharePoint Manager to investigate the content type. Do what thou wilt the important thing is to pay attention to the content type IDs.
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The Item content type, with its ID of 0x01, is the basic content type from which most other content types inherit. I say most, because in theory there is no absolute rule that you must inherit from the Item content type, so you are free to create, for example, a content type MyItem with a content type ID of 0x02.
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CHAPTER 8 THE LIQUID NITROGEN OF SHAREPOINT
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In any case, the Item content type inherits from a root content type called System that has a content type ID of 0x. On the other hand, if you examine the Document content type, you will see that it has a content type ID of 0x0101. Compared to Item, being 0x01, you now know that Document inherits from Item since its ID includes 0x01. Table 8-1 shows the most commonly used content types. Table 8-1. Common Content Types
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0x 0x01 0x0101 0x0120
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Content Type
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System Item Document Folder
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Folders Are Content Types
Yes, folders are content types. I am happy you are paying attention to details. Now, be patient for a few more moments, and I will explain. First, we need to complete the description of content type inheritance.
OK, Back to Content Type Inheritance
The concept of inheritance becomes a bit more complex when you realize that not all properties of a content type are actually inherited by children. In fact, the only things that are inherited are columns and forms. As you will learn later in this chapter, content types can be set up with behavior as well as appearance, but neither workflows nor event receivers are inherited. Also, remember what I said about propagation of changes. If you make a change to a parent content type, you need to decide whether you want those changes to be propagated to the children. If you do not propagate your changes, the changes will need to be manually added to the children later. Let s see how this could look in your site content type gallery see Figure 8-3.
CHAPTER 8 THE LIQUID NITROGEN OF SHAREPOINT
Figure 8-3. Content type hierarchy implemented The Site Content Type Gallery page provides a less than optimal overview of the hierarchy. Now you see another reason why I opted to illustrate the inheritance using the class designer in Visual Studio. So, how do the content type IDs look Look at Table 8-2, and keep in mind that these are my results and that your actual codes may be different. Table 8-2. Content Type ID Inheritance Samples
Content Type
Company document Legal document Financial report Quarterly financial report Annual report
0x010100B88CA477A46A6146A1E82817745A8915 0x010100B88CA477A46A6146A1E82817745A891501 0x010100B88CA477A46A6146A1E82817745A891502 0x010100B88CA477A46A6146A1E82817745A89150201 0x010100B88CA477A46A6146A1E82817745A89150202
Notice that company document inherits from Document (0x0101) by the 00 + GUID method, while the other types inherit from the respective parents using the two-digit method.
CHAPTER 8 THE LIQUID NITROGEN OF SHAREPOINT
Note Yeah, I know, there is no customer document there. This example is for illustrative purposes, but it s
nice to see that you are still paying attention.
So, What About Those Folders
When working with a SharePoint list or library, you can sort your items and documents in folders and subfolders. On the surface, it may then seem that items are stored inside folders in some manner. However, this is not the case. Folders are in fact little more than regular list items. Granted, they are treated differently than normal items, but they do not store items in any way. There is no actual hierarchical storage mechanism in lists or libraries. All items are stored on the same level, regardless of whether items appear to be stored inside a complex folder structure. The easiest way to realize this is to open SharePoint Manager 2007 and see how a list with folders appears. In Figure 8-4 I have created a simple custom list and added a folder on the root (Test folder 1) and another folder inside that folder (Subfolder 1). Inside each level folder, including the root, I have added an item.
Figure 8-4. Folder structure as displayed in SPM 2007 Notice that the folders I created are displayed with a folder icon. If you were to check, you would see that the folders are actually represented by SPFolder objects. However, don t let that fool you. If you look really closely at Figure 8-4, you will see that the ID property of the Subfolder item 1 is 5, even though there are only three items in the list. You may still think
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