void (final XmlElement element, final ProblemsHolder holder) { for (PsiReference ref : element.getReferences()) { ProgressManager.checkCanceled(); if (XmlHighlightVisitor.hasBadResolve(ref, true)) { if (ref.getElement() instanceof XmlElementContentSpec) { final String image = ref.getCanonicalText(); if (image.equals("-") || image.equals("O")) continue; } holder.registerProblem(ref); } } }