@Override
        public void visitXmlAttribute(@NotNull XmlAttribute attribute) {
            if (XsltSupport.isXPathAttribute(attribute)) {
                final PsiFile[] xpathFiles = XsltSupport.getFiles(attribute);
                for (PsiFile xpathFile : xpathFiles) {
                    xpathFile.accept(this);
                }
            }
        }
@Override
        public void visitXmlAttribute(@NotNull XmlAttribute attribute)