RELEASE_2_1_13/src/blocks/mail/samples/mail/resources/asciiart/serving-document-page-1.txt

 request_part_page_{page}_top_col_1
   |
 +-+------------------+
 | resource_exists_in |
 | docs_top_col_1     |
 +-+------------------+
   |
   |   +------------------+
   +---+load_page_resource|
       ++-----------------+ 
        |
        +--select
        |   +--generate_page
        |   |
        |   \--generate_default_page
        +-- serialze_xml
   +----+
   |
 response_part_page_{page}_top_col_1