class users at undefined( ) {
id
name
mail
privileges
password
};

class board_comments at undefined( ) {
id
user_id
title
text
date
priority
};

class templates at undefined( ) {
id
name
dstination
};

class trains at undefined( ) {
id
name
destination
"state"
date
coll
n_wagons
max_lenght
lenght
};

class train_comments at undefined( ) {
train_id
user_id
text
};

class wagons at undefined( ) {
id
train_id
n_order
"state"
};

class wagon_comments at undefined( ) {
id
wagon_id
user_id
text
};

dependency a1 from board_comments to users
at undefined( ) undefined( );

dependency a2 from train_comments to users
at undefined( ) undefined( );

dependency a3 from train_comments to trains
at undefined( ) undefined( );

dependency a4 from wagon_comments to users
at undefined( ) undefined( );

dependency a5 from wagon_comments to wagons
at undefined( ) undefined( );

dependency a6 from wagons to trains
at undefined( ) undefined( );