ssume you have a content type name content-type.MyContentType in plugin my-plugin, it extends content-type.MyInheritedContentType1 from plugin my-plugin and content-type.MyInheritedContentType2 from plugin my-plugin-inherit.

We get this list of possible source URIs (without Web, more complete with web plugin):

• content://WEB-INF/param/content-types/my-plugin/stylesheets/MyContentType/MyContentType-main.xsl
• content://WEB-INF/param/content-types/my-plugin/stylesheets/MyContentType/MyContentType.xsl
• plugin:my-plugin://stylesheets/MyContentType/MyContentType-main.xsl
• plugin:my-plugin://stylesheets/MyContentType/MyContentType.xsl
• content://WEB-INF/param/content-types/my-plugin/stylesheets/content-type.MyInheritedContentType1/content-type.MyInheritedContentType1-main.xsl
• content://WEB-INF/param/content-types/my-plugin/stylesheets/content-type.MyInheritedContentType1/content-type.MyInheritedContentType1.xsl
• plugin:my-plugin://stylesheets/content-type.MyInheritedContentType1-main.xsl
• plugin:my-plugin://stylesheets/content-type.MyInheritedContentType1.xsl
• content://WEB-INF/param/content-types/my-plugin-inherit/stylesheets/content-type.MyInheritedContentType2/content-type.MyInheritedContentType2-main.xsl
• content://WEB-INF/param/content-types/my-plugin-inherit/stylesheets/content-type.MyInheritedContentType2/content-type.MyInheritedContentType2.xsl
• plugin:my-plugin-inherit://stylesheets/content-type.MyInheritedContentType2-main.xsl
  plugin:my-plugin-inherit://stylesheets/content-type.MyInheritedContentType2.xsl
• plugin:my-plugin://stylesheets/default-content.xsl,
  plugin:cms://stylesheets/default-content.xsl,
• cocoon://_plugins/cms/default-content/html-main.xsl

We can see that first content type is called with it alias, and the inherit content types are called with their complete name. So if a content type has contents as final type and other as inherit type, we have to declare two stylesheets at least.