| id | aspect | description | dimension | index_letter | index_letter_crib | reserve1 | reserve2 | reserve3 |
| 1 | time | Model time | 1 | t | time | | | |
| 2 | age-cohort | age-cohorts | 1 | c | cohort | | | |
| 3 | element | chemical elements | 2 | e | element | | | |
| 4 | unity | trivial classification, 1 entry only | 3 | 1 | 1 (unity) | | | |
| 5 | region | Region of process or stock | 4 | r | region | | | |
| 6 | origin_region | Region of origin (flow) | 4 | O | origin | | | |
| 7 | destination_region | region of destination (flow) | 4 | D | destination | | | |
| 8 | process | Process where stock is located | 7 | p | process | | | |
| 9 | origin_process | Process of origin of flow | 7 | o | origin | | | |
| 10 | destination_process | Process of destination of flow | 7 | d | destination | | | |
| 11 | commodity | Goods and products considered | 6 | g | good | | | |
| 12 | engineering_material | Engineering materials considered, subset of generic materials M | 5 | m | material | | | |
| 13 | EoL_good | End-of-life products, buildings, and infrastructure | 6 | l | end-of-Life product | | | |
| 14 | waste_scrap | waste and scrap types considered | 5 | w | waste/scrap | | | |
| 15 | energy_carrier | Energy carrier | 8 | n | nergy (energy) | | | |
| 16 | scenario | Scenerios considered (e.g., SSP) | 9 | S | Scenario | | | |
| 17 | extension | Costs, emissions factors, social impacts | 10 | X | Xtension | | | |
| 18 | service | Service categories: shelter, transport, etc. | 11 | V | SerVice | | | |
| 19 | product_type | Types of products | 6 | Y | TYpe | | | |
| 20 | input_material | Input of material to process | 5 | b | none | | | |
| 21 | input_commodity | Input of commodity to process | 6 | B | none | | | |
| 22 | output_material | Output of material to process | 5 | f | none | | | |
| 23 | output_commodity | Output of commodity to process | 6 | F | none | | | |
| 24 | technology | technology class of product or commodity in the sense of product type | 6 | T | Technology | | | |
| 25 | substituting_material | refers to the material that substitutes another one | 5 | s | s_ubstituting | | | |
| 26 | material | generic material, used in MFA and LCA to denote goods and substances | 5 | M | Material | | | |
| 27 | material_group | categories of materials, such as 'reference product', 'resource, in ground', 'waste produced', used in LCI | 5 | G | material Group | | | |
| 28 | material_category | broad material groups 'product', 'waste', and 'elementary', used in LCI | 5 | C | material Category | | | |
| 29 | layer | layer of qantification: mass, volume, energy, radioactivity, monetary, ... | 12 | L | Layer | | | |
| 30 | city | City where process or stock is located, flows start or end | 4 | y | Cit_y | | | |
| 31 | layer_in | Layer of quantification for incoming flow | 12 | a | L_a_yer_in | | | |
| 32 | layer_out | Layer of quantification for outgoing flow | 12 | A | L_A_yer_out | | | |
| 33 | impact_indicator | Impact indicator of flow | 10 | I | Impact indicator | | | |
| 34 | component | component of product or other object | 6 | k | k(c)omponent | | | |
| 35 | economic_indicator | various intensive economic indicators | 10 | E | Economic indicator | | | |
| 36 | model | quantification by different models, model alternatives | 9 | R | model veRsion | | | |
| 37 | focus_object | object in focus of e.g., indicators | 14 | i | none | | | |
| 38 | reference_object | object or object group that serves as reference, e.g., for indicators | 14 | j | none | | | |
| 39 | time_frame | indicates time periods or time frames, quantitative and qualitative, for data and indicators | 1 | P | Period | | | |