RDF syntax
  - Description syntax: rdf:Description with
    about attribute
- Collection of resources are grouped into Containers:
    
      - rdf:Bag bag : a property has multiple values and
        that there is no significance to their order.
- rdf:Seq sequence : a property has multiple values
        and that the order of the values is significant.
- rdf:Alt alternative : alternatives for the
        (single) value of a property.
 
- Reification of statements (statement about statement):
    
      - rdf:subject: the resource being described by the
        modeled statement
- rdf:predicate: the original property in the
        modeled statement
- rdf:object: the property value in the modeled
        statement
- rdf:type: the type of the new resource