Each class defined must be of RDFS Class. For this there is Name-Prefix that is used for the RDF namespace. With RDF Class one can define Abstract Objects that are applied via rdf:type to create Instances of this Class. rdf:[Property](/blog/622/) is the base Class of all Properties, any property must be of this class. The base class of all Literals is rdfs:[Literal](/blog/607/). In the end all things are a subclass of some topclass that is ontop of all Class Hierarchy, which is the rdfs:[Resource](/blog/631/). So everything that is modeled is some kind of class of a resource. Everything in RDF is a resource.
There are also general classes for Datatype, additional there is a general class for Literals that stem from XML Schema Definition as there are some datatypes that can come from XML Schema. There is also a class for Container which are the aggregations of lists of RDF statements. For being a member of an container there is an RDF Membership Properties that define nothing else than membership to a given RDF Container.
rdfs:[Class](/blog/619/) Concept of a Class, defines and Abstract Object and is applied (with rdf:type) to create Instances
rdf:[Property](/blog/622/) Base class for Properties
rdfs:[Resource](/blog/631/) every entity of an RDF model is instance of this Class
and additionally
rdfs:Datatype
A property always relates one class with another, therefore one has to define which is the domain and which is the range class.
