xmlns:atom="http://www.w3.org/2005/Atom"
with:
:
historical activity level for hydrogen production referred to 100 % hydrogen
:
historical production volume fraction of pure hydrogen in year k of the baseline period
:
historical activity level for hydrogen production referred to historical hydrogen content expressed as norm cubic meters per year referring to 0 °C and 101,325 kPa in year k of the baseline period