In the previous recipe, we learnt how to create a site column using the SharePoint object model. In this recipe, we will create a site column using a declarative XML and add it to the contacts content type.
Contacts content type provides a way to store the contacts in SharePoint. It provides various columns to store contact's name, phone number, fax, web page, and so on. Out of the box, it does not provide a way to categorize these contacts. We will extend this content type so we can categorize our contacts as sales lead, customer, or vendor
You should have completed the previous recipe successfully.