protected void validateExtensionPoint(Element element) {
    if (assertAttributeDefined(element, "id", CompilerFlags.ERROR)) { // $NON-NLS-1$
      Attr idAttr = element.getAttributeNode("id"); // $NON-NLS-1$
      double schemaVersion = getSchemaVersion();
      String message = null;
      if (schemaVersion < 3.2 && !IdUtil.isValidSimpleID(idAttr.getValue()))
        message = NLS.bind(MDECoreMessages.Builders_Manifest_simpleID, idAttr.getValue());
      else if (schemaVersion >= 3.2) {
        if (!IdUtil.isValidCompositeID(idAttr.getValue())) {
          message = NLS.bind(MDECoreMessages.Builders_Manifest_compositeID, idAttr.getValue());
        }
      }

      if (message != null)
        report(
            message,
            getLine(element, idAttr.getName()),
            CompilerFlags.WARNING,
            MDEMarkerFactory.CAT_OTHER);
    }

    assertAttributeDefined(element, "name", CompilerFlags.ERROR); // $NON-NLS-1$

    int severity = CompilerFlags.getFlag(fProject, CompilerFlags.P_UNKNOWN_ATTRIBUTE);
    NamedNodeMap attrs = element.getAttributes();
    for (int i = 0; i < attrs.getLength(); i++) {
      Attr attr = (Attr) attrs.item(i);
      String name = attr.getName();
      if ("name".equals(name)) { // $NON-NLS-1$
        validateTranslatableString(element, attr, true);
      } else if (!"id".equals(name)
          && !"schema".equals(name)
          && severity != CompilerFlags.IGNORE) { // $NON-NLS-1$ //$NON-NLS-2$
        reportUnknownAttribute(element, name, severity);
      }
    }

    severity = CompilerFlags.getFlag(fProject, CompilerFlags.P_UNKNOWN_ELEMENT);
    if (severity != CompilerFlags.IGNORE) {
      NodeList children = element.getChildNodes();
      for (int i = 0; i < children.getLength(); i++)
        reportIllegalElement((Element) children.item(i), severity);
    }

    // Validate the "schema" attribute of the extension point
    Attr attr = element.getAttributeNode(IMonitorExtensionPoint.P_SCHEMA);
    // Only validate the attribute if it was defined
    if (attr != null) {
      String schemaValue = attr.getValue();
      IResource res = getFile().getProject().findMember(schemaValue);
      String errorMessage = null;
      // Check to see if the value specified is an extension point schema and it exists
      if (!(res instanceof IFile
          && (res.getName().endsWith(".exsd")
              || //$NON-NLS-1$
              res.getName().endsWith(".mxsd")))) // $NON-NLS-1$
      errorMessage = MDECoreMessages.ExtensionsErrorReporter_InvalidSchema;
      // Report an error if one was found
      if (errorMessage != null) {
        severity = CompilerFlags.getFlag(fProject, CompilerFlags.P_UNKNOWN_RESOURCE);
        if (severity != CompilerFlags.IGNORE)
          report(
              NLS.bind(errorMessage, schemaValue),
              getLine(element),
              severity,
              MDEMarkerFactory.CAT_OTHER);
      }
    }
  }