anchor.diff:  The authors in each chapter document are aggregated together with the authors in the master file.
   
   |username
  -|Used to resolve an avatar for the author that is displayed in the header of a chapter.
  +|Used to resolve the avatar for the author that is displayed in the header of a chapter when the `publication-type` is set to a value other than `book`.
   The avatar image should be located at the path _\{imagesdir}/avatars/\{username}.jpg_, where `\{username}` is the value of this attribute.
   
   |producer
  
positive.code: 
  == Working with Images
  
  Images that your AsciiDoc document references should be saved in the directory defined in the `imagesdir` attribute, which defaults to the directory of the document.
  {project-name} will discover all local image references and insert the images into the EPUB3 archive at the same relative path.
  
  WARNING: Currently including images only works correctly if you set `imagesdir` to the directory `images` like in the example shown above.
  This will be fixed in future versions.
  
  The sample book contains placeholder images for an author avatar and a book cover.
  
  
negative.code: :front-cover-image: image:cover.png[Front Cover,1050,1600]
  ----
  
  The image is resolved relative to the directory specified in the `imagesdir` attribute, which defaults to the directory of the spine document.
  The image can be in any format, though we recommend using PNG, JPG, or SVG as they are the most portable formats.
  
  IMPORTANT: *You should always specify the dimensions of the cover image.*
  This ensures the viewer will preserve the aspect ratio if it needs to be scaled to fit the screen.
  If you don't specify a width and height, then the dimensions are assumed to be 1050x1600.
  
  === How to Organize Images by Chapter
  
  You can set the `imagesdir` attribute per chapter (as long as the attribute is not overridden by the API).
  To do so, use an attribute entry to set the value of the `imagesdir` attribute on the line above the include directive for a chapter.
  
  [source,asciidoc]
  ----
  :imagesdir: chapter-one/images
  \include::chapter-one.adoc[]
  
  :imagesdir: chapter-two/images
  \include::chapter-two.adoc[]
  ----
  
  == About the Theme
  
  