private void checkUriConsistency(PageCompilingContext pc, Node element) {
    String uriAttrib = element.attr("action");
    if (null == uriAttrib) uriAttrib = element.attr("src");
    if (null == uriAttrib) uriAttrib = element.attr("href");

    if (null != uriAttrib) {

      // Verify that such a uri exists in the page book,
      // only if it is contextual--ignore abs & relative URIs.
      if (uriAttrib.startsWith("/"))
        if (null == pageBook.nonCompilingGet(uriAttrib))
          pc.warnings.add(
              CompileError.in(element.outerHtml())
                  .near(element.siblingIndex()) // TODO - line number
                  .causedBy(CompileErrors.UNRESOLVABLE_FORM_ACTION, uriAttrib));
    }
  }