Database Tamino Define Foreign key

Hi,

is anyone know how we kind define a foreign key in Tamino! For exmple between two collections lik in SQL Server where we can define a foreign key which refer a primary in another table.

Thansk your help

Cédric

see if this documentation section helps: http://techcommunity.softwareag.com/ecosystem/documentation/webmethods/tamino/ins82/tsl/tsextphys.htm#index-reference