Pset_ProductRequirementsDefinition from IAI: Categorization of the required properties of an entity that are used to determine what the level of the requirement is, to enable its performance/quality to be determined, assessed, or measured, and compared against the requirement, and then to analyze whether the entity is suitable for use within a given context..IfcProduct entityIfcProductNameSubject matter for which a value is to be reported.CategoryA reference to a classification of the degree of aggregation or granularity of topic data such as regional, local etc.GroupNameName of grouping of topics.ClassificationA reference to a classification of the topicDemandValueValue of the subject matter as determined using an agreed scale for what is required.DemandThresholdValueValue of the subject matter above or below which a special significance is attached.DemandImportanceValueImportance of the topic relative to the importance of other topics.SupplyEvaluationValueValue of the subject matter as determined using an agreed scale for what is provided, or capable of being provided.GapValueDifference determined between the topic demand value and the topic supply evaluation value.GapValueWeightedDifference determined between the topic demand value and the topic supply evaluation value, weighted for topic demand importance value.