Xml xsi:schemaLocation使用org.w3c具有多个值

我正在尝试将多个值附加到schemaLocation属性：

Document document = null;
        Element documentElement = null;
        final DocumentBuilderFactory factory = DocumentBuilderFactory
            .newInstance();
        Element root = null;
        try {
            final DocumentBuilder builder = factory.newDocumentBuilder();
            document = builder.newDocument();

            root = document.createElement("kml");
            document.appendChild(root);
            documentElement = document.createElement("Document");
            final Element topNameElement = document.createElement("name");
            documentElement.appendChild(topNameElement);
            root.appendChild(documentElement);

            root.setAttributeNS("http://www.w3.org/2000/xmlns/","xmlns:xsi",
                "http://www.w3.org/2001/XMLSchema-instance");
            root.setAttribute("xmlns", "http://schemas.opengis.net/kml/2.2.0");
            root.setAttribute("xmlns:ar", "http://schemas.opengis.net/arml/2.0");
            root.setAttribute("xsi:schemaLocation", "http://schemas.opengis.net/kml/2.2.0  http://schemas.opengis.net/kml/2.2.0/ogckml22.xsd    http://schemas.opengis.net/arml/2.0     http://schemas.opengis.net/arml/2.0/arml.xsd");

然而，结果是：

<?xml version="1.0" encoding="UTF-8"?><kml xmlns="http://schemas.opengis.net/kml/2.2.0" xmlns:ar="http://schemas.opengis.net/arml/2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://schemas.opengis.net/kml/2.2.0  http://schemas.opengis.net/kml/2.2.0/ogckml22.xsd &#9;http://schemas.opengis.net/arml/2.0 &#9;http://schemas.opengis.net/arml/2.0/arml.xsd">
<kml>

</kml>

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如何添加多个值以删除编码

是一个空白字符。在代码中，在schemaLocation条目之间使用额外的空格。试着每次将其缩小到一个空间