$\newcommand{\Dev}{\operatorname{Dev}}$ $\newcommand{\dev}{\operatorname{dev}}$ $\newcommand{\grad}{\operatorname{grad}}$ $\newcommand{\divg}{\operatorname{div}}$ $\newcommand{\Ei}{\operatorname{Ei}}$ $\newcommand{\tr}{\operatorname{tr}}$

The node-data model uses a tabulated list of nodal values as the target for the optimization. In addition, it requires an output variable that will be matched against the nodal data.

<Objective type="node-data">
  <var type="[enter variable name]"/>
  <data>
    <node id="1">0.123</elem>
    ...
  </data>
</Objective>

The variable can be any of the node output data listed in the logfile section (See 3.18.1.1↑).