As fas as I understood, ui:define is used in files acting as template clients and ui:insert is used in files acting as master templates of Facelets technology go hand in hand and the linkage between the two happens through the "name" attribute. But I see that the "name" attribute is optional for ui:insert but mandatory for ui:define. Why so?
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The <ui:insert/> can also be used in tag files to insert tag body content.
E.g.
/WEB-INF/tags/someTag.xhtml
<ui:composition ...>
<p>Some HTML ...</p>
<ui:insert/>
<p>Some other HTML...</p>
<ui:composition>
which is to be used as
<my:someTag ...>
<p>This content will end up in place of ui:insert.</p>
</my:someTag>
This is particularly useful for datatables by the way:
/WEB-INF/tags/dataTable.xhtml
<ui:composition ...>
<h:dataTable ...>
<ui:insert/>
</h:dataTable>
<ui:composition>
which is to be used as
<my:dataTable ...>
<h:column>...</h:column> <!-- can also be another tag file! -->
</my:dataTable>
Note that the above isn't possible with composite components.
