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The IT example below shows tobacco filler and the types of tobacco of which it is composed, each listed as tobacco ingredients (IGDCMPID) for the Tobacco Product CIG01A (SPTOBID). The variable ITSPECIF shows the specification (variety) of the first three tobaccos. ITIGDPLX is used to indicate that the Tobacco Filler and the Reconstituted Tobacco are complex ingredients (they both have two or more sub-components). The details of which single tobacco ingredients compose these complex ingredients is made explicit in the IQ dataset example further down). ITCURMTH indicates the cure method. ITSPFL is used to indicate whether complex ingredients were made to the applicant's specification. TPMF indicates the Tobacco Product Master File.
Note that there are two varieties of burley tobacco in this tobacco product, thus each is given a unique IGDCMPID value (Burley Tobacco and Burley Tobacco 2).

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The IN dataset example below shows the list of non-tobacco ingredients

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used in the tobacco product identified as CIG01A. Each unique ingredient is listed in IGDCMPID. Where applicable, IUPAC name and CAS number are listed (IUPACNAM and CASNO, respectively). INIGDPLX is used to indicate whether an ingredient is a single ingredient or a complex ingredient. INSPFL indicates whether complex ingredients were made to the applicant's specification. Grade, purity, manufacturer name and ID number, and the Tobacco Product Master  File number File number complete the dataset.

Dataset wrap
Name IN
Dataset2 Row DOMAIN STUDYID SPTOBID IGDCMPID INMANUF INMANUFN TPMF IUPACNAM CASNO INIGDPLX INSPFL INGRADE INPURTY 1 IN TOB07 CIG01A Cocoa Extract Flavor House A FLVR1234 MF5555555 COMPLEX INGREDIENT N 2 IN TOB07 CIG01A Butyric Acid butanoic acid 107-92-6 SINGLE INGREDIENT Food ≥99% 3 IN TOB07 CIG01A Cellulose Filter A MFR A FIL789 - COMPLEX INGREDIENT N 4 IN TOB07 CIG01A Cellulose Acetate cellulose acetate 9004-35-7 SINGLE INGREDIENT 5 IN TOB07 CIG01A Triacetin 1,3-diacetyloxypropan-2-yl acetate 102-76-1 SINGLE INGREDIENT 6 IN TOB07 CIG01A FSC Paper B MFR B FSC123 COMPLEX INGREDIENT N 7 IN TOB07 CIG01A Cellulose Pulp cellulose pulp 65996-61-4 SINGLE INGREDIENT 8 IN TOB07 CIG01A Calcium Carbonate calcium carbonate 471-34-1 SINGLE INGREDIENT 9 IN TOB07 CIG01A Sodium Alginate sodium;3,4,5,6-tetrahydroxyoxane-2-carboxylate 9005-38-3 SINGLE INGREDIENT 10 IN TOB07 CIG01A Trisodium Citrate trisodium;2-hydroxypropane-1,2,3-tricarboxylate 6132-04-3 SINGLE INGREDIENT 11 IN TOB07 CIG01A Cationic Starch starch, 2-hydroxy-3-(trimethylammonio)propyl ether, chloride 56780-58-6 SINGLE INGREDIENT 12 IN TOB07 CIG01A Seam Adhesive MFR C ADV123 MF2345678 - COMPLEX INGREDIENT N 13 IN TOB07 CIG01A Methylcellulose 9004-67-5 SINGLE INGREDIENT 14 IN TOB07 CIG01A 1,3-Butanediol Butane-1,3-diol 34844-08-1 SINGLE INGREDIENT

Finally, the IQ domain is used to represent the quantity (target, minimum and maximum) of each ingredient identified in IGDCMPID that the product (SPTOBID) is designed to contain, with the units for these values represented in IQUNIT. The function of each ingredient is described in IQFUNCT. Ingredients that appear in more than one component of the tobacco product are quantified separately for each component. IQPARENT identifies the ingredient or component of which a component or complex ingredient composed of the sub-ingredientcomponents/sub-component ingredients shown in IDGCMPID is a partIDGCMPID. IQLEVEL is used to identify at what level

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in the overall hierarchy the that sub-component/ sub-ingredient appears.
The following implementation rules apply:

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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 an IQLEVEL value of "1" in IQLEVEL.
• Records describing sub-components/ingredients that compose a parent component listed in the dataset will have IQPARENT value equal to the IGDCMPID of that 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 (or components ) and the sub-components/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 component and its sub-component components/ingredients in the IQ domain structure. 

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