Add industry material demands and required tags

definitions/variable/industry/demand.yaml

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+# material demand by commodity
+- Demand|Iron and Steel|Steel:
+    description: Demand of steel commodities
+    unit: Mt/yr
+- Demand|Non-Metallic Minerals|Cement:
+    description: Demand of cement
+    unit: Mt/yr
+- Demand|Non-Ferrous Metals|Aluminum:
+    description: Demand of aluminum
+    unit: Mt/yr
+- Demand|Non-Ferrous Metals|Copper:
+    description: Demand of copper
+    unit: Mt/yr
+- Demand|Chemicals|{Chemicals Commodity}:
+    description: Demand of {Chemicals Commodity}
+    unit: Mt/yr
+
+# material demand by commodity and demand sector
+- Demand|Iron and Steel|Steel|{Demand Sector}:
+    description: Demand of steel commodities in {Demand Sector}
+    unit: Mt/yr
+- Demand|Non-Metallic Minerals|Cement|{Demand Sector}:
+    description: Demand of cement in {Demand Sector}
+    unit: Mt/yr
+- Demand|Non-Ferrous Metals|Aluminum|{Demand Sector}:
+    description: Demand of aluminum in {Demand Sector}
+    unit: Mt/yr
+- Demand|Non-Ferrous Metals|Copper|{Demand Sector}:
+    description: Demand of copper in {Demand Sector}
+    unit: Mt/yr
+- Demand|Chemicals|{Chemicals Commodity}|{Demand Sector}:
+    description: Demand of {Chemicals Commodity} in {Demand Sector}
+    unit: Mt/yr

definitions/variable/industry/tag_chemical_commodities.yaml

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+- Chemicals Commodity:
+    - Ammonia:
+        description: ammonia (NH3), precursor chemical for nitrogen fertilisers
+        tier: "1"
+    - Nitrogen Fertilizer:
+        description: single-nutrient nitrogen fertilizers and nitrogen containing
+          multi-nutrient fertilizers
+        tier: "2"
+    - High-Value Chemicals:
+        description: high-value chemicals, a group of primary chemicals consisting of
+          ethylene, propylene, butylenes and aromatics
+        tier: "1"
+        navigate: High Value Chemicals
+        engage: High Value Chemicals
+    - High-Value Chemicals|Ethylene:
+        description: ethylene, most important precursor for synthetic plastics
+        tier: "2"
+    - High-Value Chemicals|Propylene:
+        description: propylene, second most important precursor for synthetic plastics
+        tier: "2"
+    - High-Value Chemicals|BTX:
+        description: the aromatic compounds Benzene, Toluene and the three xylene isomers (BTX)
+        tier: "2"
+    - Plastics:
+        description: plastics
+        tier: "1"
+    - Plastics|Primary:
+        description: plastics, produced from virgin feedstocks
+        tier: "2"
+        navigate: Plastics|Primary Plastics
+        engage: Plastics|Primary Plastics
+    - Plastics|Secondary:
+        description: plastics, produced in recycling processes
+        tier: "2"
+        navigate: Plastics|Secondary Plastics
+        engage: Plastics|Secondary Plastics
+    - Methanol:
+        description: methanol, used as precursor for various chemicals and fuels
+        tier: "1"
+    - Formaldehyde:
+        description: formaldehyde, mainly used to produce resins
+        tier: "3"
+    - Formaldehyde Resins:
+        description: thermosetting resins, produced by polymerizing urea, phenol and/or
+          melamine with formaldehyde
+        tier: "3"

definitions/variable/industry/tag_demand_sectors.yaml

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+- Demand Sector:
+    - Electricity:
+        description: electricity generation sector
+    - Electricity|{Generation Technology}:
+          description: electricity generation with {Generation Technology}
+    - Electricity|Transmission and Distribution:
+          description: electricity transmission and distribution
+    - Transportation:
+        description: transport sector
+    - Residential:
+        description: residential sector
+    - Commercial:
+        description: commercial sector
+    - Infrastructure|Mobility:
+        description: mobility infrastructure

definitions/variable/industry/tag_generation_technologies.yaml

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+- Generation Technology:
+    - Nuclear:
+        description: nuclear power plants
+    - Solar:
+        description: solar PV
+    - Wind:
+        description: wind power plants
+    - Gas:
+        description: gas power plants
+    - Coal:
+        description: coal power plants
+    - Biomass:
+        description: biomass power plants
+    - Hydro:
+        description: hydro power plants