"next_item_id int unsigned not null default 0," . //the item after this one in the sequential learning order (MySQL id)
"display_order int unsigned not null default 0," . //this is needed for ordering items under the same parent (previous_item_id doesn't give correct order after reordering)
"prerequisite char(64) null," . //prerequisites in AICC scripting language as defined in the SCORM norm (allow logical operators)
"parameters text null," . //prerequisites in AICC scripting language as defined in the SCORM norm (allow logical operators)
"launch_data text not null default '')"; //data from imsmanifest <item>