I have xml input of:

<colspec colname="col1" colwidth="0.51*" />
<colspec colname="col2" colwidth="2.79*" />
<colspec colname="col3" colwidth="0.28*" />
<colspec colname="col4" colwidth="0.81*" />
<colspec colname="col5" colwidth="0.79*" />
<colspec colname="col6" colwidth="0.81*" />


and expect output of:
<col width="8.514%">
<col width="46.578%">
<col width="4.674%">
<col width="13.523%">
<col width="13.189%">
<col width="13.523%">


and:

<colspec colname="col1" colwidth="2.41*" />
<colspec colname="col2" colwidth="11.61pt" />
<colspec colname="col3" colwidth="0.59*" />


to:
<col width="77.983%">
<col width="2.926%">
<col width="19.091%">


whats the simplest rule?