docs: @SuppressWarnings("unchecked")
      private void inheritNamespaces(SchemaImpl schema, Definition wsdl) {
          Map<String, String> wsdlNamespaces = wsdl.getNamespaces();
          
          for (Entry<String, String> nsEntry: wsdlNamespaces.entrySet()) {
              if (StringUtils.hasText(nsEntry.getKey())) {
                  if (!schema.getElement().hasAttributeNS(WWW_W3_ORG_2000_XMLNS, nsEntry.getKey())) {
                      schema.getElement().setAttributeNS(WWW_W3_ORG_2000_XMLNS, "xmlns:" + nsEntry.getKey(), nsEntry.getValue());
                  }
              } else { // handle default namespace
                  if (!schema.getElement().hasAttribute("xmlns")) {
                      schema.getElement().setAttributeNS(WWW_W3_ORG_2000_XMLNS, "xmlns" + nsEntry.getKey(), nsEntry.getValue());
                  }
              }
          }
      }