text: 7 For historic reasons there are many datatypes that are seldom used, e.g., xsd:int which is similar to xsd:Integer. 
  For numbers, the default datatypes are xsd:integer for integers and xsd:decimal for real numbers. Unless you have 
  a good reason to use a different numeric datatype it is best to stick with these default types. E.g., when you write a 
  SWRL rule if you use a number SWRL will infer that any integers are xsd:integer and any rationals are xsd:decimal. 
  
  49 