void (@NotNull XmlDocument document, @NotNull ValidationHost host) { if (document.getLanguage() == DTDLanguage.INSTANCE) { final List<XmlElementDecl> decls = new ArrayList<>(3); XmlUtil.processXmlElements(document, new PsiElementProcessor() { @Override public boolean execute(final @NotNull PsiElement element) { if (element instanceof XmlElementDecl) decls.add((XmlElementDecl)element); return true; } }, false); XmlUtil.doDuplicationCheckForElements( decls.toArray(new XmlElementDecl[0]), new HashMap<>(decls.size()), XML_ELEMENT_DECL_PROVIDER, host ); return; } ExternalDocumentValidator.doValidation(document,host); }