@Override
  public void applyFix(final @NotNull Project project, final @NotNull ProblemDescriptor descriptor) {
    XmlTag tag = (XmlTag)descriptor.getPsiElement();
    XmlAttribute attribute = tag.setAttribute(myAttrName, myNamespace.equals(tag.getNamespace()) ? "" : myNamespace, myAttrValue);
    VirtualFile virtualFile = tag.getContainingFile().getVirtualFile();
    if (virtualFile != null) {
      PsiNavigationSupport.getInstance().createNavigatable(project, virtualFile,
                                                           attribute.getValueElement().getTextRange().getStartOffset() +
                                                           1).navigate(true);
    }
  }
@Override
  public void applyFix(final @NotNull Project project, final @NotNull ProblemDescriptor descriptor)