Category
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Field Description:
Some RSS directories allow users to search for feeds that they are interested in, by category. Category has one optional attribute.  
 
category:  
The name of a category that the feed belongs to. This value will can be used alone, or if the domain field is use, it should be a valid option from that domain's categories  
 
domain:  
A string that identifies the taxonomy for categorization.  
 
You can create your own categories, but typically you will want to use a more standard predefined category. DMOZ is probably the most popular category system.  
 
Example DMOZ category: Computers/Internet/On_the_Web/Weblogs/Tools  
 
If a predefined category is used (i.e. from DMOZ), you should set the category domain field to point to the category system's website.  
 
Example DMOZ domain: http://www.dmoz.org  
 
Field Usage:
This is an optional field.  

Reference:
http://blogs.law.harvard.edu/tech/rss