I am making a module to add a specific code completion to XML files.
I can't add attributes to the schema in my XML, because the parser that read the XML does not support it.

I created a simple XML and XSD file to test it out.
The XML file:

<note>
  <from>Me</from>
  <to>You</to>
  <content>I want some help.</content>
</note>

The XSD file:

<xs:schema>
<xs:element name="note">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="to" type="xs:string"/>
      <xs:element name="from" type="xs:string"/>
      <xs:element name="content" type="xs:string"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>
</xs:schema>


So what I tried to do was to use the addCompletionModel method of CompletionContextImpl to add my completion model but I don't get code completion.
I looked at the source code of CompletionContextImpl and I found out that for completion models that have no namespace, I need to have the "noNamespaceSchemaLocation" attribute set in my XML document for the model to be set as the default "noNamespaceModel" of the CompletionContextImpl. I can clearly see that during "initModels", the line 

if(noNamespaceSchemaLocation != null && noNSModels.size() == 1)

stop it from setting my "no namespace model" if I don't have the "noNamespaceSchemaLocation" in my XML.

I tried it out and simply by changing my XML file to:

<note noNamespaceSchemaLocation="">
  <from>Me</from>
  <to>You</to>
  <content>I want some help.</content>
</note>

I will finally get code completion, but since I can't add the "noNamespaceSchemaLocation" in my XML, I can't use that solution.