The element <techPubBase> contains the technical publication baseline to which the data module is written. The publication baseline number represents the technical build standard of the Product, which defines the technical standard by reference to a certain point in time. This is achieved by declaring a "Cut-off date" or milestone and listing the drawing set standard, relevant modification documents, etc, issued prior to the Cut-off or milestone date and used as source material for the production of data modules. The technical standard so defined, ensures that all data modules are to the same standard. Projects can also decide to use this element to record the delivery number of the Logistics Support Analysis Record (LSAR) to which the data module is written.