(topic task taskreq-d) The preliminary-requirements (<prelreqs>) section of a task should document things the user needs to know or do before starting the current task. The <prelreqs> element is similar to <prereq> but contains a more descriptive content model then <prereq>. The closing-requirements (<closereqs>) element describes steps or tasks that the user should do after the successful completion of the current task. closereqs is similar to postreq but contains a more descriptive content model then postreq and has been developed basically to meet the requirements in the machinery industry. The required-conditions (<reqconds>) element contains the description of all required conditions that have to be fulfilled before performing a task. The No-Required-Condition (<noconds>) element has to be used when there is no required condition. The information that no condition is required is as important as the information which conditions are required. The Required-Condition (<reqcond>) element has to be used to describe the required condition. The Required-Condition-Technical-Publication (<reqcontp>) element has to be used to list or describe further applicable documents. The Required-Personnel (<reqpers>) element contains information on the personnel required for the task. The <personnel> element indicates the number of personnel required for the task. The Personnel-Category (<perscat>) element contains the required category level of the person. The Personnel-Skill-Level (<perskill>) element describes the required skill level of the person. The Estimated-Time-Spent (<esttime>) element contains information on the estimated time required for a task. The Support-Equipment (<supequip>) element lists any required support equipment for the task, along with optional descriptions. The No-Support-Equipment (<nosupeq>) element has to be used when there is no support equipment required. The information that no support equipment is required is as important as the information which support equipment is required. The Support-Equipment-List (<supeqli>) element has to be used to list any support equipment required for the task. The Support-Equipment-Item (<supequi>) element describes the support equipment. The <supplies> element has to be used to list and maybe to describe any supplies required for the task. The No-Supplies (<nosupply>) element has to be used when there are no supplies required. The information that no supplies are required is as important as the information which supplies are is required. The Supply-List (<supplyli>) element has to be used to list any supplies required for the task. The <supply> element describes the supply. The <spares> element lists spare parts required for a task, and may include descriptions of those parts. The No-Spares (<nospares>) element has to be used when there are no spares required for the task. As the information that no spares are required is as important as the information which spare is required. The Spares-List (<sparesli>) element has to be used to list any spares required for the task. The spare element describes a spare part required for the task, and may include a description of the part. The Safety-Condition (<safety>) element has to be used to list and maybe to describe any safety condition that has to be taken in account for the task. The No-Safety-Conditions (<nosafety>) element has to be used to indicate that there are no safety requirements for the task. The information that no safety requirements have to be taken in account is as important as the information which safety conditions has to be considered. The Safety-Conditions (<safecond>) element has to be used if there are safety requirements.