__________________Method 1__________________

post[23](
 int_tag=15---------------------
 string_content="Some post"    |
 id_owner=1                    |
 date=123456)                  |
                               |
    ----------------------------
    |
    |
    V
tag_assoc[15](        ---->  tag_assoc[17](          ---------> tag_assoc[18](
 id_tag=12-------     |       id_tag=20---------     |           id_tag=21-----------
 id_owner=1     |     |       id_owner=3       |     |           id_owner=2         |
 int_flink=17---|------       int_flink=18-----|------           int_flink=0        |
 )              |             )                |                 )                  |
                |                              |                                    |
      -----------                              |                                    |
      |                                        |                                    |
      V                                        V                                    V
tag[12](                                  tag[20](                              tag[21](
 string_name=cats                          string_name=dogs                      string_name=technology
 id_owner=20                               id_owner=5                            id_owner=2
 date=123456)                              date=10000)                           date=16116)

__________________Method 2__________________

// The struct in array_tags is id_owner,id_tag.
// The array_tags field is stored in the database as TEXT or VARCHAR

post[23](
 array_tags=[
  1,12-----------------
  3,20----------------|--------------------------------------------------------------
  2,21----------------|-------------------------                                    |
 ]                    |                        |                                    |
 content="Some post"  |                        |                                    |
 owner=1              |                        |                                    |
 date=123456)         |                        |                                    |
                      |                        |                                    |
                      |                        |                                    |
      -----------------                        |                                    |
      |                                        |                                    |
      V                                        V                                    V
tag[12](                                  tag[20](                              tag[21](
 string_name=cats                          string_name=dogs                      string_name=technology
 id_owner=20                               id_owner=5                            id_owner=2
 date=123456)                              date=10000)                           date=16116)


*** What about searching BY tag? We will need a lookup table with either Method 1 or Method 2!

__________________Method 3__________________

// from: http://stackoverflow.com/questions/20856/how-do-you-recommend-implementing-tags-or-tagging
// also used in the toxi solution: http://www.pui.ch/phred/archives/2005/04/tags-database-schemas.html
// This solution will satisfy both
// a) returning all tags for a post
// b) returning all posts for a tag
// Downfall: For both searching by post or searching by tag, or retreiveing all tags for a post,
// the entire tag_assoc table must be searched.

post[23](
 string_content="Some post"
 id_owner=1
 date=123456)
      ^
      |
      -------------------------------------------------------------------------------
               |                               |                                    |
tag_assoc[15]( |             tag_assoc[17](    |                tag_assoc[18](      |
 id_post=23-----              id_post=17--------                 id_post=17----------
 id_owner=1                   id_owner=3                         id_owner=2
 id_tag=12------|             id_tag=20---------                 int_tag=21----------
 )              |             )                |                 )                  |
                |                              |                                    |
      -----------                              |                                    |
      |                                        |                                    |
      V                                        V                                    V
tag[12](                                  tag[20](                              tag[21](
 string_name=cats                          string_name=dogs                      string_name=technology
 id_owner=20                               id_owner=5                            id_owner=2
 date=123456)                              date=10000)                           date=16116)