[Rdfapi-php-interest] Storage Problem

i have an ontology of size 200 KB. When i try to load this with rdf api tool using MemModel it gives sometimes an error memory exhausted or the ontology is wrongly loaded.
 For example:
 URI of my ontology is http://www.owl-ontologies.com/ontology/muenze.owl#
 and URI of the instance should be http://www.owl-ontologies.com/ontology/muenze.owl#Instance
 but there are instances with wrong URI i.e. http://www.owl-ontologies.com/ontology/instance

 Is there any limit for the size of ontology being loaded with rdf-api?

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