code: private DatatypeStreamingValidator streamingValidatorFor(String uri,
              String localName, Attributes atts) {
          if (XHTML_URL.equals(uri)) {
              if ("time".equals(localName) && (atts.getIndex("", "datetime") < 0)) {
                  return TimeDatetime.THE_INSTANCE.createStreamingValidator(null);
              }
              if ("script".equals(localName) && atts.getIndex("", "src") >= 0) {
                  return ScriptDocumentation //
                          .THE_INSTANCE.createStreamingValidator(null);
              }
          }
          return null;
      }
docs: Returns a <code>DatatypeStreamingValidator</code> for the element if it
  needs <code>textContent</code> checking or <code>null</code> if it does
  not.
  
  @param uri
  the namespace URI of the element
  @param localName
  the local name of the element
  @param atts
  the attributes
  @return a <code>DatatypeStreamingValidator</code> or <code>null</code> if
  checks not necessary