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This file should contain the field names found in the product’s metadata (in the ES documents), so it can be referenced in codebase.

e.g ANALYSIS_END_DATETIME_METADATA = "AnalysisEndDateTime"

This file is usually stored in PCM repositories at commons/constants/

You can import it in adaptation code as follows:

from commons.constants import product_metadata

You can then use it as python constants. For example, product_metadata.ANALYSIS_END_DATETIME_METADATA in the code. This is done so that we don’t need to hardcode the field names and update them from project to project. Generic functions can be carried over / reused between projects by just updating the constants values in the config files.