使用 xmlwriter 写入 xmlns 条目的问题

Question

我的 .xml-files:

中正好需要这个 header

<document xsi:schemaLocation="http://www.xxxxx.ch/schema/2.1 
http://www.xxxxx.ch/schema/xxxxx_2.1.01.xsd" 
xmlns="http://www.xxxxx.ch/schema/2.1" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

我无法根据需要创建文件，因为 xmlwriter 在我的所有尝试中都抛出了错误（尝试了一整天以来我发现的任何东西）。
这里缺少什么——如何根据需要生成文件？代码被截断：

Dim settings As XmlWriterSettings = New XmlWriterSettings()
settings.Indent = True
settings.CloseOutput = True
Dim cFileExport As String = cTempAblagenPfad + cFilenameExport_XML
Using writer As XmlWriter = XmlWriter.Create(cFileExport, settings)
writer.WriteStartDocument()
'
writer.WriteStartElement("document")
writer.WriteAttributeString("xsi", "schemaLocation", vbNull, "http://www.xxxxx.ch/schema/2.1 http://www.xxxxx.ch/schema/xxxxx_2.1.01.xsd")
' Generates XML: <document xsi:schemaLocation="http://www.xxxxx.ch/schema/2.1 http://www.xxxxx.ch/schema/xxxxx_2.1.01.xsd" xmlns:xsi="1">
' I have no idea, why xmlns:xsi="1" is generated by the xml-writer - maybe that’s the problem?
writer.WriteAttributeString("xmlns", "http://www.xxxxx.ch/schema/2.1", XmlSchema.InstanceNamespace) 
' throws: "The prefix "xmlns" is reserved for XML
writer.WriteAttributeString("xmlns", "http://www.xxxxx.ch/schema/2.1") 
' throws: "the prefix '' cannot be changed from '' to 'http://www.xxxxx.ch/schema/2.1' in the same startelement tag"
 writer.WriteAttributeString("xmlns", "xsi", vbNull, "http://www.w3.org/2001/XMLSchema-instance")
‘throws: "The prefix "xmlns" is reserved for XML
....

感谢任何提示..

Answer 1

经过大量的尝试和错误，我自己找到了解决方案：

代码：

Dim cNameSpace As String = "http://www.xxxxx.ch/schema/2.1"
Dim cSchemaInstance As String = "http://www.w3.org/2001/XMLSchema-instance"
'
Using writer As XmlWriter = XmlWriter.Create(cFileExport, settings)
  writer.WriteStartDocument()
  writer.WriteStartElement("document", cNameSpace) ------
  writer.WriteAttributeString("xmlns", "xsi", "http://www.w3.org/2000/xmlns/", cSchemaInstance)
  writer.WriteAttributeString("xsi", "schemaLocation", cSchemaInstance, "http://www.xxxxx.ch/schema/2.1 http://www.xxxxx.ch/schema/xxxxx_2.1.01.xsd")

生成：

<document xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
xsi:schemaLocation="http://www.xxxxx.ch/schema/2.1  
http://www.xxxxx.ch/schema/eSchKG_2.1.01.xsd"  
xmlns="http://www.xxxxx.ch/schema/2.1">

与示例中的顺序不完全相同，但这并不重要...
该文件现在被系统接受为有效，我必须将文件发送到那里。

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