Dear Vedrin, All,
 There's an issue with the validation of my RDF representations for
algorithms. They seem to be semantically incorrect. As you already know,
the following errors are reported by the online OWL validator at
http://www.mygrid.org.uk/OWL/Validator :

  * Untyped Object Property: http://www.opentox.org/api/1.1#parameters 
      * Untyped Object Property: http://www.opentox.org/api/1.1#isA   
      * Untyped Data Property: http://purl.org/dc/elements/1.1/date 
      * Untyped Data Property: http://purl.org/dc/elements/1.1/source 
      * Untyped Data Property: http://purl.org/dc/elements/1.1/relation 
      * Untyped Data Property:
        http://purl.org/dc/elements/1.1/publisher 
      * Untyped Data Property:
        http://purl.org/dc/elements/1.1/identifier 
      * Untyped Data Property: http://purl.org/dc/elements/1.1/title 
      * Untyped Data Property:
        http://purl.org/dc/elements/1.1/description 
      * Untyped Data Property:
        http://www.opentox.org/api/1.1#paramScope 
      * Untyped Data Property:
        http://www.opentox.org/api/1.1#paramValue 
      * Untyped Data Property:
        http://purl.org/dc/elements/1.1/contributor 
      * Untyped Data Property: http://purl.org/dc/elements/1.1/creator 
      * Untyped Data Property: http://purl.org/dc/elements/1.1/rights 
      * Untyped Individual: http://opentox.ntua.gr:3000/algorithm/mlr 
      * Untyped Individual:
        http://www.opentox.org/api/1.1#RegressionEagerSingleTarget 



However I don't understand why it appears that all properties are
untyped. I have assigned XSD datatype declarations to every Literal. For
example the validator claims that the property
http://purl.org/dc/elements/1.1/date is Untyped, but its value is
"2009/16/12"^^http://www.w3.org/2001/XMLSchema#date.

Could you give me some instructions on how to cope with this issue?

Best Regards,
Pantelis