I'm trying to build a Windows Workflow (WF) project using NAnt, but it doesn;t seem to be able to build the ".xoml" and ".rules" files.

Here is the code of the csc task that I'm using:

<csc debug="${build.Debug}" warninglevel="${build.WarningLevel}" target="library" output="${path::combine(build.OutputDir,assembly.Name+'.dll')}" verbose="${build.Verbose}" doc="${path::combine(build.OutputDir,assembly.Name+'.xml')}">
  <sources basedir="${assembly.BaseDir}">
    <include name="**/*.cs" />
    <include name="**/*.xoml" />
    <include name="**/*.rules" />
  </sources>
  <resources basedir="${assembly.BaseDir}">
    <include name="**/*.xsd" />
    <include name="**/*.resx" />
  </resources>
  <references>
    ...
  </references>
</csc>

Here's the output:

Compiling 21 files to 'c:\Output\MyWorkFlowProject.dll'.

[csc] c:\Projects\MyWorkFlowProject\AProcessFlow.xoml(1,1): error CS0116: A namespace does not directly contain members such as fields or methods

[csc] c:\Projects\MyWorkFlowProject\BProcessFlow.xoml(1,1): error CS0116: A namespace does not directly contain members such as fields or methods

[csc] c:\Projects\MyWorkFlowProject\CProcessFlow.rules(1,1): error CS0116: A namespace does not directly contain members such as fields or methods

[csc] c:\Projects\MyWorkFlowProject\CProcessFlow.xoml(1,1): error CS0116: A namespace does not directly contain members such as fields or methods