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我正在尝试按如下方式创建 xml 内容，这里我使用的是 libxml2 和 c++。我在 libxml2 库 api 上编写了包装器并尝试使用它。但是当我尝试向其中一个元素添加属性时遇到以下错误.我在谷歌搜索找出类似的问题，但不能。请帮助我。提前致谢。

<?xml version="1.0" encoding="UTF-8"?>
<Environment>
 <PlatformSection>
  <Kind>NOVA</Kind>
  <Version>2013.1</Version>
  <Vendor>Openstack</Vendor>
  <Locale>en</Locale>
 </PlatformSection>
 <PropertySection>
  <Property oe:key="com.cisco.csr1000v.mgmt-interface" oe:value="GigabitEthernet1"/>
 </PropertySection></Environment>

我的代码如下所示，我使用的是 c++ libxml2 xmltextwriter。

    XmlWriter wtr;
      wtr.StartWriting("test.xml");
      wtr.StartDocument("1.0","UTF-8");
      wtr.StartElement("Environment");
      wtr.StartIndenting();
      wtr.StartElement("PlatformSection");
      wtr.WriteElement("Kind","NOVA");
      wtr.WriteElement("Version","2013.1");
      wtr.WriteElement("Vendor","Openstack");
      wtr.WriteElement("Locale","en");
      wtr.EndElement();
      wtr.StartElement("PropertySection");
      wtr.StartElement("Property");
      wtr.AddAttribute("oe:key","com.cisco.csr1000v.mgmt-interface");
      wtr.AddAttribute("oe:value","GigabitEthernet1");
      wtr.EndElement();
      wtr.EndElement();
      wtr.freeTextWriter();

在哪里

     bool AddAttribute(const std::string& attribute_name,
                        const std::string& attribute_value) {
           return xmlTextWriterWriteAttribute(writer_,
                                           BAD_CAST attribute_name.c_str(),
                                           BAD_CAST attribute_value.c_str()) >= 0;
        }

我的 o/p 给出以下错误，

namespace error : Namespace prefix oe for key on Property is not defined
<Property oe:key="com.cisco.csr1000v.mgmt-interface" oe:value="GigabitEthernet1"
                                                                               ^
namespace error : Namespace prefix oe for value on Property is not defined
<Property oe:key="com.cisco.csr1000v.mgmt-interface" oe:value="GigabitEthernet1"
                                                                               ^
error : xmlTextWriterWriteDocCallback : XML error 201 !
I/O error : flush error
Entity: line 11: parser error : Extra content at the end of the document
 </PropertySection>
                   ^
error : xmlTextWriterWriteDocCallback : XML error 5 !
xml is
 <?xml version="1.0" encoding="ISO-8859-1"?>
<Environment>
 <PlatformSection>
  <Kind>NOVA</Kind>
  <Version>2013.1</Version>
  <Vendor>Openstack</Vendor>
  <Locale>en</Locale>
 </PlatformSection>
 <PropertySection>
  <Property key="com.cisco.csr1000v.mgmt-interface" value="GigabitEthernet1"/>
 </PropertySection></Environment>
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