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• IQPARENT must correspond to a value of IGDCMPID in the same dataset. If parent is null, the ingredient is considered a top-level component and is assigned a value of "1" in IQLEVEL.
• Records describing ingredients that are sub-component ingredients of another ingredient/components/ingredients that compose a parent component listed in the dataset will have IQPARENT value equal to the IGDCMPID of that ingredient/parent component. IQLEVEL will be set to n +1, where n=the parent record's value of IQLEVEL. 
• Every value of IGDCMPID used in the IQ dataset must have a matching value of IGDCMPID:
  • In the IT dataset (when IQCAT=TOBACCO INGREDIENT) or,
  • In the IN dataset (when IQCAT=NON-TOBACCO INGREDIENT)
  • Therefore, IQCAT is required to relate ingredient quantity records in IQ to the associated ingredient attributes described in either IT or IN.

The use of IQPARENT and IQLEVEL help make explicit the relationship between complex ingredients /(components) and their constituent ingredientsthe ingredients of which they are composed, and can assist when totaling the quantities of an ingredient that appears in multiple components of a tobacco product. 
The concept map below illustrates the representation of the hierarchical relationships between a complex ingredient component and its sub-component ingredients in the IQ domain structure. 

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