anchor.diff:  //
   // * list of assemblies where this module is included              <1>
   
  -[id="<module-anchor>_{context}"]                                   <2>
  -= Module title                                                     <3>
  -----
  -
  -<1> List of assemblies in which this module is included.
  -<2> A module anchor with {context} that must be lowercase and must match the module's file name.
  -<3> Human readable title. To ensure consistency in the results of the
  +:_content-type: <TYPE>                                             <2>
  +[id="<module-anchor>_{context}"]                                   <3>
  += Module title                                                     <4>
  +----
  +
  +<1> The content type for the file. Replace `<TYPE>` with the actual type of the module, `CONCEPT`, `REFERENCE`, or `PROCEDURE`. Place this attribute before the anchor ID or, if present, the conditional that contains the anchor ID.
  +<2> List of assemblies in which this module is included.
  +<3> A module anchor with {context} that must be lowercase and must match the module's file name.
  +<4> Human readable title. To ensure consistency in the results of the
   leveloffset values in include statements, you must use a level one heading
   ( = ) for the module title.
   
  
positive.code: ----
  $ ln -s ../../images/ images
  $ ln -s ../../modules/ modules
  ----
  +
  Be sure to adjust the number of levels to back up (`../`) depending on how deep your directory is.
  
negative.code: // Text snippet included in the following modules:    <2>
  //
  // * list of modules where this text snippet is included
  
  :_content-type: SNIPPET                               <3>
  ----
  <1> List of assemblies in which this text snippet is included.
  <2> List of modules in which this text snippet is included.
  <1> The content type for the file. For snippets, always use `:_content-type: SNIPPET`. Place this attribute before the anchor ID, the conditional that contains the anchor ID, or the first line of body text.
  
  [NOTE]
  ====
  