Following is the code snippet which I am trying to use to set the plain text in RRC rich text editor

        String title = "MyDocument7";
        String description = "This is a test document created";
        //Note: primary text must be in xhtml compliant format
        String primaryText = "<div xmlns=\"http://www.w3.org/1999/xhtml\" >Test Document</div>";
                           
        //Create a requirement request - Note the URL is "" because the requirement is not yet created
        RequirementRequest req = new RequirementRequest(server, "", shapeURL);
        req.setDcTitle(title);
        req.setDcDescription(description);
       
        //Add any internal properties to request by getting property URI from shape
        String primaryTextPropURI = findPropertyByTitle(doc, "Primary Text");
        System.out.println("printing the property URI ... "+primaryTextPropURI);
        req.addRMLiteralProperty(primaryTextPropURI, primaryText);
        //System.out.println("getting the content based on URI "+req.getPrimaryText(primaryTextPropURI));

Now the artifact does get created correctly but the primaryTextPropURI does not have the correct value. The return from the method findPropertyByTitle is null. The method conatins the following snippet:

protected String findPropertyByTitle(Document doc, String title) throws Exception {
        String propertyDefinition = "//oslc:Property[oslc:name=\"" + title +"\"]/oslc:propertyDefinition/@rdf:resource";
        XPath xpathNamespace = getXpathNamespace();
        Node node = (Node) xpathNamespace.evaluate(propertyDefinition, doc, XPathConstants.NODE);
        if(node != null){
            return node.getTextContent();
        }
        return null;
    }

Can someone help understand why this does not work.