The Layouter is used to configure the front end form for the models and its records. A simple html syntax is used without head and body tags.
<tab name="Tab_Name" active="true">
...
</tab>
<data name="Properties">
<variable ident="ident_name" />
</data>
<variable ident="calendar_start" access="write" />
<variable ident="calendar_end" access="write" />