private boolean isInNamespacesToRemove(String uri) {
        for (String namespace : namespacesToRemove) {
            if (uri == namespace) {
                return true;
            }
        }
        return false;
    }
@see org.xml.sax.helpers.XMLFilterImpl#startElement(java.lang.String,
     java.lang.String, java.lang.String, org.xml.sax.Attributes)
src/nu/validator/xml/NamespaceDroppingXMLReaderWrapper.java