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A provision in a statute, rule of procedure, or the like, that is a mere direction or instruction of no obligatory force and involves no invalidating consequence for its disregard, as opposed to an imperative or mandatory provision, which must be followed. The general rule is that the prescriptions of a statute relating to the performance of a public duty are so far directory that, though neglect of them may be punishable, it does not affect the validity of the acts done under them, as in the case of a statute requiring an officer to prepare and deliver a document to another officer on or before a certain day.

Generally, statutory provisions that do not relate to the essence of a thing to be done, and as to which compliance is a matter of convenience rather than of substance, are directory, while provisions that relate to the essence of a thing to be done, that is, matters of substance, are mandatory.

West's Encyclopedia of American Law, edition 2. Copyright 2008 The Gale Group, Inc. All rights reserved.

DIRECTORY. That which points out a thing or course of proceeding; for example, a directory law.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
If (+dsml + dX2 - [DELTA]saf >0) then Xl_dgap_p = dsml + dX2 - [DELTA]saf else Xl_dgap_p=0 (15)
Next step is to analyze the effectiveness of this safety mechanism and find regions where we cannot guarantee a detection of a deviation larger than the safety requirement limit [DELTA]saf considering the safety-mechanism limit dsml and the shift due to measurement tolerance dX.
Xl_agap_p = d_lim _n + [DELTA]X1 + [DELTA]saf = dsml + dX2 + [DELTA]saf (24)
Xl_agap_n = dsaf - [DELTA]X1 - d_lim_p = dsml - dX2 - [DELTA]saf (25)
The availability of tools that facilitate the design and implementation of DSMLs is another important factor for the acceptance and adoption of MDE.
An industrial standard to describe DSMLs is the Meta-Object Facility (MOF) [24] provided by the Object Management Group (OMG).
By combining code generation techniques with DSMLs, it is possible to separate domain concerns from implementation details.
DSMLs are usually specified by metamodels that are defined as instances of a general purpose modelling language.