freemarker-core/src/main/java/freemarker/ext/dom/SunInternalXalanXPathSupport.java [58:110]:
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    synchronized public TemplateModel executeQuery(Object context, String xpathQuery) throws TemplateModelException {
        if (!(context instanceof Node)) {
            if (context == null || isNodeList(context)) {
                int cnt = context != null ? ((List) context).size() : 0;
                throw new TemplateModelException(
                        (cnt != 0
                                ? "Xalan can't perform an XPath query against a Node Set (contains " + cnt
                                        + " node(s)). Expecting a single Node."
                                : "Xalan can't perform an XPath query against an empty Node Set."
                        )
                        + " (There's no such restriction if you configure FreeMarker to use Jaxen for XPath.)");
            } else {
                throw new TemplateModelException(
                        "Can't perform an XPath query against a " + context.getClass().getName()
                                + ". Expecting a single org.w3c.dom.Node.");
            }
        }

        Node node = (Node) context;
        try {
            XPath xpath = new XPath(xpathQuery, null, CUSTOM_PREFIX_RESOLVER, XPath.SELECT, null);
            int ctxtNode = xpathContext.getDTMHandleFromNode(node);
            XObject xresult = xpath.execute(xpathContext, ctxtNode, CUSTOM_PREFIX_RESOLVER);
            if (xresult instanceof XNodeSet) {
                NodeListModel result = new NodeListModel(node);
                result.xpathSupport = this;
                NodeIterator nodeIterator = xresult.nodeset();
                Node n;
                do {
                    n = nodeIterator.nextNode();
                    if (n != null) {
                        result.add(n);
                    }
                } while (n != null);
                return result.size() == 1 ? result.get(0) : result;
            }
            if (xresult instanceof XBoolean) {
                return ((XBoolean) xresult).bool() ? TemplateBooleanModel.TRUE : TemplateBooleanModel.FALSE;
            }
            if (xresult instanceof XNull) {
                return null;
            }
            if (xresult instanceof XString) {
                return new SimpleScalar(xresult.toString());
            }
            if (xresult instanceof XNumber) {
                return new SimpleNumber(Double.valueOf(((XNumber) xresult).num()));
            }
            throw new TemplateModelException("Cannot deal with type: " + xresult.getClass().getName());
        } catch (TransformerException te) {
            throw new TemplateModelException(te);
        }
    }
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freemarker-core/src/main/java/freemarker/ext/dom/XalanXPathSupport.java [54:105]:
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    synchronized public TemplateModel executeQuery(Object context, String xpathQuery) throws TemplateModelException {
        if (!(context instanceof Node)) {
            if (context == null || isNodeList(context)) {
                int cnt = context != null ? ((List) context).size() : 0;
                throw new TemplateModelException(
                        (cnt != 0
                                ? "Xalan can't perform an XPath query against a Node Set (contains " + cnt
                                        + " node(s)). Expecting a single Node."
                                : "Xalan can't perform an XPath query against an empty Node Set."
                        )
                                + " (There's no such restriction if you configure FreeMarker to use Jaxen for XPath.)");
            } else {
                throw new TemplateModelException(
                        "Can't perform an XPath query against a " + context.getClass().getName()
                                + ". Expecting a single org.w3c.dom.Node.");
            }
        }
        Node node = (Node) context;
        try {
            XPath xpath = new XPath(xpathQuery, null, CUSTOM_PREFIX_RESOLVER, XPath.SELECT, null);
            int ctxtNode = xpathContext.getDTMHandleFromNode(node);
            XObject xresult = xpath.execute(xpathContext, ctxtNode, CUSTOM_PREFIX_RESOLVER);
            if (xresult instanceof XNodeSet) {
                NodeListModel result = new NodeListModel(node);
                result.xpathSupport = this;
                NodeIterator nodeIterator = xresult.nodeset();
                Node n;
                do {
                    n = nodeIterator.nextNode();
                    if (n != null) {
                        result.add(n);
                    }
                } while (n != null);
                return result.size() == 1 ? result.get(0) : result;
            }
            if (xresult instanceof XBoolean) {
                return ((XBoolean) xresult).bool() ? TemplateBooleanModel.TRUE : TemplateBooleanModel.FALSE;
            }
            if (xresult instanceof XNull) {
                return null;
            }
            if (xresult instanceof XString) {
                return new SimpleScalar(xresult.toString());
            }
            if (xresult instanceof XNumber) {
                return new SimpleNumber(Double.valueOf(((XNumber) xresult).num()));
            }
            throw new TemplateModelException("Cannot deal with type: " + xresult.getClass().getName());
        } catch (TransformerException te) {
            throw new TemplateModelException(te);
        }
    }
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