Bug 66967 [Contributions] PropertyParser should be deprecated (or removed)
Internal class org.eclipse.ui.ide/org.eclipse.ui.internal.ide.model/PropertyParser should be deprecated. People should be using the extension point org.eclipse.core.runtime.contentTypes instead Note that the tags XML_FIRST_TAG and XML_DTD_NAME have already been deprecated. Can we actually remove these instead of deprecating them?
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/model/PropertyParser.java
IResourceActionFilter.XML_DTD_NAME);
        try {
            parseResource.setPersistentProperty(qname, systemId);
        } catch (CoreException c) {
            IDEWorkbenchPlugin
                    .log("Problem parsing dtd element", c.getStatus()); 
        }
    }
    /*
     * (non-Javadoc)
     * 
     * @see org.xml.sax.ext.LexicalHandler#startEntity(java.lang.String)
     */
    public void startEntity(String name) throws SAXException {
        
    }
    /*
     * (non-Javadoc) Resolve external entity definitions to an empty string.
     * This is to speed up processing of files with external DTDs. Not resolving
     * the contents of the DTD is ok, as only the System ID of the DTD
     * declaration is used.
     * 
     * @see org.xml.sax.helpers.DefaultHandler#resolveEntity(java.lang.String,
     *      java.lang.String)
     */
    public InputSource resolveEntity(String publicId, String systemId)
            throws SAXException {
        return new InputSource(new StringReader("")); 
    }
}