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CHAPTER 9 STROLLING THROUGH FIELDS OF GOLD
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Some of the attributes shown here require further explanation. ID is a GUID that uniquely identifies a site column within a site collection. Note the minor detail of being unique with a site collection. Next, the name attributes as you can see, there are actually four names in use here: Name, StaticName, DisplayName, and ColName. In addition, there are two more attributes that denote a column s name in different scenarios. Luckily, we need to concern ourselves with only two of these names, the Name and DisplayName attributes. Name is the internal name of a field and is rarely, if ever, shown to a user. Name cannot be changed for a column; once it is set, that s the name with which you are stuck. This is in contrast to DisplayName, which is shown as the name of the field to users in the web interface. Users, or you, can change the DisplayName attribute without messing up the column. You should use this distinction to your advantage. When you are working with fields in code, you often reference fields by Name, which makes sense since this value never changes. However, if you have a column titled Things to do, the Name value would have to be accessed as Things_0x0020_to_0x0020_do, which is inconvenient. Instead, you can set DisplayName to Things to do and set Name to Tasks or ThingsToDo. That way, you maintain the best of both worlds: you get a descriptive title and a convenient internal name for use in code.
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If you create a column with spaces in the name using the web interface, SharePoint autogenerates Tip the name with the 0x0020 notation for spaces. To avoid this, create the column using the name you want to use internally, and then rename the column to the descriptive name you want the user to see. Only the DisplayName will be changed when you modify a column s name in the web interface. This also applies to other special characters that cannot be used by SharePoint internally. My first name, Bj rn, would be translated to Bj_x00f8_rn if I were to use that as a column name.
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Here s a quick explanation of the other name attributes. The ColName attribute is used to specify the name that should be used when storing the column in the SharePoint database. A related and similarly seldom used attribute is JoinColName, which is used in place of ColName when doing SQL joins. XName is used only internally and is related to handling changes in XML forms. You will never use any of these three attributes yourself; they are related to how SharePoint stores your columns in the database, but you should know what they do. StaticName is a bit bewildering. The documentation states that you can use this attribute to get or set the internal name of a field. Knowing that there is no way we can change the internal name of a column after it has been provisioned, this may seem a bit strange. The confusing bit here is that StaticName is a semihidden attribute that defaults on get requests to the internal name of a field, which is the Name attribute we must set. However, you can change the StaticName attribute to another value, and in that case, that value is returned instead of the Name value of the column. See Table 9-1.
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CHAPTER 9 STROLLING THROUGH FIELDS OF GOLD
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Table 9-1. StaticName vs. Name Return Values
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StaticName [Nothing] MyStaticName Name MyField MyField SPField.StaticName Returns... MyField MyStaticName
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Most developers (and Microsoft in its default out-of-the-box site columns) just set StaticName to the same value as Name. Next, the Type attribute defines the field type used to store and optionally display the data stored in the column. There are several built-in types, such as text, integer, computed, date/time, yes/no, and choice, and you can create your own types as well. We will explore this a bit later in 11. (A bit in that sentence is the same bit as there is a bit of water in the sea. ) The Group attribute of the Field element serves the same function as the Group attribute in content types in that it is used to group columns in some fashion. The string is completely arbitrary, and you can write whatever value you want. SharePoint will create a new group if no matching groups exist and remove the group if no columns belong to a group anymore. The grouping serves no technical purpose other than helping you arrange columns in a logical group structure. There are no parent-child groups either. The grouping is most frequently seen on the Site Column Gallery page, as shown in Figure 9-2.
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Figure 9-2. Site column groups The ReadOnly and Sealed attributes work in the same way as with content types. The ReadOnly attribute can be turned off in the interface, while Sealed requires direct object model access from a site collection administrator. See the descriptions for the ReadOnly and Sealed attributes in 8 for more information.
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