Schema.org terms converted formats

Hello there, 
I am trying to understand why there is difference between the 
automatically scraped formats from the Schema.org terms (RDF/XML, 
RDF/Turtleetc) found at :  http://schema.rdfs.org/ and the official OWL 
version of the terms is directly maintained at Schema.org. 

Yet, the note said that the official OWL version of the terms is directly 
maintained at Schema.org and independent from the above presented formats, 
but most of our community are using the above formats and the differences 
may causes some difficulties.

The main observed difference is in properties range when it is "literal" 
in OWL format, it's converted in "xsd:string" in automatically scraped 
formats, although it's stated that all those formats are automatically 
scraped from the Schema.org terms on a daily basis. Can we have a reliable 
tool to produce Schema.org terms as they are in the original official OWL 
version? By the way is this OWL version (from http://schema.rdfs.org/ ) 
up-to-date?

Kind Regards,

Marc Twagirumukiza | Agfa HealthCare
Senior Clinical Researcher | HE/Advanced Clinical Applications Research
T  +32 3444 8188 | M  +32 499 713 300

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