Inside the <tankdata> section information concerning a breathing gas consumption calculation is put into brackets. As many as needed <tankdata> elements can appear one after the other, but all have to stand after the <mix> elements.
<breathingconsumptionvolume>, <mixref/>, <tankref/>, <tankpressurebegin>, <tankpressureend>, <tankvolume>
(see also <gasdefinitions>)
<gasdefinitions>
<!-- previous statements -->
...
<mix id="air">
<name>air</name>
<o2>0.21</o2>
<n2>0.79</n2>
<he>0.0</he>
<ar>0.0</ar>
<h2>0.0</h2>
</mix>
<tankdata>
<mixref ref="air"/>
<tankvolume>0.01</tankvolume>
<tankpressurebegin>20000000.0</tankpressurebegin>
<!-- because the breathing consumption volume is given - in [m^3/s] units! - -->
<!-- the end pressure information can be omitted -->
<!-- 20 litres / minute ^= 0.00033333... m^3/s -->
<breathingconsumptionvolume>0.000333333333</breathingconsumptionvolume>
</tankdata>
<!-- here more statements -->
</gasdefinitions>
<!-- previous statements -->
...
<gasdefinitions>
<mix id="gas1">
<!-- the name of a breathing gas used is also allowed to be only a number -->
<name>1</name>
<o2>0.21</o2>
<n2>0.79</n2>
<he>0.0</he>
<ar>0.0</ar>
<h2>0.0</h2>
</mix>
<tankdata>
<mixref ref="gas1"/>
<!-- because start and end pressure are given, the breathing -->
<!-- consumption volume can be calculated without need for -->
<!-- the tank volume -->
<tankpressurebegin>20000000.0</tankpressurebegin>
<tankpressureend>10400000.0</tankpressureend>
</tankdata>
</gasdefinitions>
<!-- here more statements -->