mechanism 

Definition of placement of a single electrophysiological mechanism (e.g. channel mechanism)
on a group of cables of a cell. Note there should be at least one of these to specify the passive membrane conductance.
Note: elements spec_capacitance, spec_axial_resistance, ion_props etc. should be used in preference to specificCapacitance etc!

Element Information

Model

parameter* , variableParameter* , variable_parameter*
Children: parameter, variableParameter, variable_parameter

Attributes

QName Type Fixed Default Use Inheritable Annotation
name xs:string required 
Name of the mechanism. Should refer to a named mechanism in a ChannelML file
passiveConductance xs:boolean false optional 
Whether this is a passive/leak conductance. NOTE: this attribute will be removed in v2.0!! Use passive_conductance instead.
Changed for consistency with ChannelML and NetworkML naming conventions.
passive_conductance xs:boolean false optional 
Whether this is a passive/leak conductance. In this case, 2 params, gmax and e should be sufficient to fully specify the
    mechanism, independent of any implementation. Useful e.g. for mapping to and from inbuilt mechanisms in simulators (e.g. pas in NEURON, Em/Rm in GENESIS).
NOTE: this attribute will be required in v2.0!! Don't use passiveConductance anymore.
    Changed for consistency with ChannelML and NetworkML naming conventions.
type MechanismType required 
Specifies the type of cellular mechanism (Channel Mechanism/Ion Concentration). Note could be used for any type of electrophysiological property of a section of a cell

Source 

<xs:element name="mechanism" type="Mechanism" minOccurs="1" maxOccurs="unbounded">
  <xs:annotation>
    <xs:documentation>Definition of placement of a single electrophysiological mechanism (e.g. channel mechanism) on a group of cables of a cell. Note there should be at least one of these to specify the passive membrane conductance. Note: elements spec_capacitance, spec_axial_resistance, ion_props etc. should be used in preference to specificCapacitance etc!</xs:documentation>
  </xs:annotation>
</xs:element>

Sample