PKIT_MACRO — Placeholder for components.
<MODEL_VAR NAME="<PKIT_MACRO NAME=headline>">
<MODEL_LOOP NAME="<PKIT_MACRO NAME=loop>">
<MODEL_VAR NAME="title"/>
</MODEL_LOOP>
A PKIT_MACRO is replaced with the value of the key in PKIT_COMPONENT that match the name of the macro.
This tag is only valid inside a template that is loaded with PKIT_COMPONENT