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  1. It is envisaged that descriptions of requirements may be specified by users or generated by suitable algorithms but, in both cases, users' choices will be given priority in determining the profile of requirements they want to use at any time.
  2. It is understood that some users will have conditional requirements such as "from 8 am to 6 pm I would like white text on black but from 6 pm to 8 am I would like  yellow text on blue".
  3. Some users will specify requirements without which they cannot perceive a resource, essential requirements, needs, and some users will also want to specify preferences in cases where they can manage without the requirement but find it easier if they can have it.
  4. The definition of terms will be achieved in compliance interoperable with ISO/IEC N 19788.

4.2 Extending the Standard