OCA schema bases contain a "classification" meta attribute to enable industry sector tagging for the purposes of schema categorisation. In order to establish commonality across sector-specific Working Groups (WGs), Task Forces (TFs) and Focus Groups (FGs) at Trust over IP, 12 industry sectors are defined below for general use.
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Energy Sector
The Energy Sector comprises companies engaged in exploration & production, refining & marketing, and storage & transportation of oil & gas and coal & consumable fuels. It also includes companies that offer oil & gas equipment and services.
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| Sector | Industry Group | Industry | Sub-Industry |
| 10 - Energy | 1010 - Energy | 101010 - Energy Equipment & Services | 10101010 - Oil & Gas Drilling |
| 10101020 - Oil & Gas Equipment & Services | |||
| 101020 - Oil, Gas & Consumable Fuels | 10102010 - Integrated Oil & Gas | ||
| 10102020 - Oil & Gas Exploration & Production | |||
| 10102030 - Oil & Gas Refining & Marketing | |||
| 10102040 - Oil & Gas Storage & Transportation | |||
| 10102050 - Coal & Consumable Fuels |
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