RDF Validation

Hi,
 
I need some help.
 
When validating the RDF syntax of an RDF/XML file by means of the W3C RDF
Validation Service <http://www.w3.org/RDF/Validator/>  I got Error E201 all
over the place, all at the same kind of place, and I don't understand what
could possibly be wrong. I checked the file for XML well-formedness, and it
passed the test.
 
Below is a snippet of the file, and the related error message. I colored
that line 185 in red (the fifth line of the snippet, for the colorblind
e-mail systems). Strange enough the validator didn't have problems with the
comment line 10 lines below (marked in green) 
 
    <owl:Class rdf:ID="Activity">
        <rdfs:subClassOf>
            <owl:Class rdf:resource="#PossibleIndividual"/>
        </rdfs:subClassOf>
        <rdfs:comment
rdf:datatype="http://www.w3.org/2001/XMLSchema#string">
            DEFINITION An Activity is a PossibleIndividual that brings about
change by 
            causing the Event that marks the Beginning, or the Event that
marks the 
            Ending of a PossibleIndividual .
            An Activity consists of the temporal parts of those members of 
            PossibleIndividual that participate in the Activity. The
participating 
            temporal parts will be classified by the
ParticipatingRoleAndDomain 
            that indicates the role of the temporal part in the Activity .
        </rdfs:comment>
        <rdfs:comment
rdf:datatype="http://www.w3.org/2001/XMLSchema#string">
            EXAMPLE Pumping a fluid with a mechanical pump can be
represented by an 
            instance of Activity .          
        </rdfs:comment>
    </owl:Class>
 
Error: {E201} Unusual Syntax error when processing general start element
tag. Encountered general start element tag Was expecting one of: XML ELEMENT
CONTENT end element tag [Line = 185, Column = 9]
 
Any hints?
 
Regards,
Hans
 
 
_______________________ 
Hans Teijgeler
ISO 15926 specialist
 <http://www.InfowebML.ws> www.InfowebML.ws
 <mailto:hans.teijgeler@quicknet.nl> hans.teijgeler@quicknet.nl
phone +31-72-509 2005