How to include multiple columns from extra file in <p:dataTable>? - jsf-2

Question

I use objects of different classes inside a <p:dataTable> and want to conditionally render multiple <p:column> for the different classes. I do not want to use <p:columns> as I would have to provide the data on what columns should be rendered mostly from a bean and I just want to do it in Facelets.
Actually I could do it just like shown below but for many different classes with different properties this would grow messy. I want all columns that are rendered on a certain condition included from another file.
<p:dataTable value="#{myBean.object} var="object">
<p:column rendered="#{myBean.classOfObject == 'Car'}" />
#{object.yearOfConstruction}
</p:column>
<p:column rendered="#{myBean.classOfObject == 'Person'}">
#{object.dateOfBirth}
</p:column>
</p:dataTable>

Answer 1

I am still open to suggestions to the following approach as well as new ones:
datatable.xhtml
<c:set var="isCar" value="#{param.type == 'Car'}" />
<p:dataTable value="#{myBean.object} var="object">
<ui:include src="car.xhtml"/>
</p:dataTable>
car.xhtml
<p:column rendered="#{isCar}" />
#{object.yearOfConstruction}
</p:column>
<p:column rendered="#{isCar}" />
#{object.color}
</p:column>
I am still not happy with the repeating rendered-condition.