XML file format in c# using XmlWriter having namespace and prefixes

Question

Here is the required XML format that I am looking for:

<mf:package 
 xmlns="urn:x-lexisnexis:content:manifest:global:1"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="urn:x-lexisnexis:content:manifest:global:1 sch_manifest.xsd"
 mf:mf="urn:x-lexisnexis:content:manifest:global:1">

What I am getting is:

<mf:package 
 xmlns="urn:x-lexisnexis:content:manifest:global:1"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="urn:x-lexisnexis:content:manifest:global:1 sch_manifest.xsd" 
 xmlns:mf="urn:x-lexisnexis:content:manifest:global:1">

The code I am using is:

using (XmlWriter writer = XmlWriter.Create(parentPathPackage + packageID + "_man.xml", settings))
{
    writer.WriteStartElement("mf", "package", "urn:x-lexisnexis:content:manifest:global:1");
    writer.WriteAttributeString("", "xmlns", null, "urn:x-lexisnexis:content:manifest:global:1");
    writer.WriteAttributeString("xmlns", "xsi", null, "http://www.w3.org/2001/XMLSchema-instance");
    writer.WriteAttributeString("xsi", "schemaLocation", null, "urn:x-lexisnexis:content:manifest:global:1 sch_manifest.xsd");

What am I doing wrong here?

here the difference is: mf:mf="urn:x-lexisnexis:content:manifest:global:1" this is required. and I am getting: xmlns:mf="urn:x-lexisnexis:content:manifest:global:1" — Humza Munir
– Humza Munir, Commented Apr 2, 2021 at 17:08
Your desired XML is not well-formed. Upload it to xmlvalidation.com and you will get an error, Errors in the XML document: 1: 250 The prefix "mf" for element "mf:package" is not bound. Specifically, you define an element <mf:package ... but never associate the mf prefix to a namespace. mf:mf=".." is not the correct way to do that. xmlns:mf=".." is the correct way, i.e. XmlWriter fixed it for you automatically. (That is, unless your XML is a fragment of some larger document that does define the mf namespace.) — dbc
– dbc, Commented Apr 2, 2021 at 17:13
<mf:package xmlns="urn:x-lexisnexis:content:manifest:global:1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:x-lexisnexis:content:manifest:global:1 sch_manifest.xsd" mf:mf="urn:x-lexisnexis:content:manifest:global:1"> <mf:metadata allOrNone="0" contentProviderID="KM_SEC_CONTENT" contentProviderIDScheme="Knowledge Mosaic ID" id="abc"> <mf:dataFiles mf:mf="urn:x-lexisnexis:content:manifest:global:1"> — Humza Munir
– Humza Munir, Commented Apr 2, 2021 at 17:32

dbc · Accepted Answer · 2021-04-02 17:59:03Z

Assuming you are writing the root XML element, your desired XML is not well-formed:

<mf:package 
   xmlns="urn:x-lexisnexis:content:manifest:global:1" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
   xsi:schemaLocation="urn:x-lexisnexis:content:manifest:global:1 sch_manifest.xsd" 
   mf:mf="urn:x-lexisnexis:content:manifest:global:1"> <!--mf:mf is not correct -->

Upload it to https://www.xmlvalidation.com/ and you will get an error,

Errors in the XML document: 1: 250 The prefix "mf" for element "mf:package" is not bound.

Specifically, you define an element <mf:package ... but never associate the mf prefix to a namespace. mf:mf="..." is not the correct way to do that. Instead, a namespace declaration attribute must either be xmlns or begin with xmlns:, so xmlns:mf="..." is the correct way:

<mf:package 
   xmlns="urn:x-lexisnexis:content:manifest:global:1" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
   xsi:schemaLocation="urn:x-lexisnexis:content:manifest:global:1 sch_manifest.xsd" 
   xmlns:mf="urn:x-lexisnexis:content:manifest:global:1">  <!--Corrected -->

Since this is the XML you are actually getting, XmlWriter generated well-formed XML for you automatically.

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