[Rdfapi-php-interest] Merging OntModels

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Greetings all,

playing around with RAP (V0.9.2) I try to merge two models read from
different files.  If I do this with with addModel() on Models created by
getMemModel() everything seems to work as expected.  However, the code
below, where I create the models with getOntModel(), gives the following
error:

        Fatal error: RDFAPI error (class: Statement; method: new):
        Resource expected as subject.
        in /usr/local/include/rdfapi-php/api/model/Statement.php on line
        61

Here is the code:

        <html xmlns="http://www.w3.org/1999/xhtml">
          <head>
            <title>Event-Overview</title>
          </head>
          <body>
            <?php
        define ("RDFAPI_INCLUDE_DIR",
        "/usr/local/include/rdfapi-php/api/");
        include (RDFAPI_INCLUDE_DIR . "RdfAPI.php");

        $ZInfoOntologyModel =
        ModelFactory::getOntModel(INFMODELF,RDFS_VOCABULARY);
        $ZInfoOntologyModel->load ("../schemas/zinfo.rdf");

        $ZInfoModel =
        ModelFactory::getOntModel(INFMODELF,RDFS_VOCABULARY);
        $ZInfoModel->load ("zinfo.rdf");

        $ZInfoModel->addModel ($ZInfoOntologyModel);

        echo $ZInfoModel->writeAsHTMLTable();
            ?>
          </body>
        </html>

Since getOntModel() is supoosed to be returning a MemModel as well,
shouldn't I just be able to exchange one for the other?  Am i missing
something?

Thanks for any help!

Regards,
Lars