can i mention general form xaml (pre .net 4 framework)?

in xaml i announce datatemplate template used whenever specific form displayed. example, datatemplate textblock arrangement name customer:

<datatemplate datatype="{x:type my:customer}">
    <textblock text="{binding name}" />
</datatemplate>

i'm wondering it's illusory interpretation datatemplate used any an ilist<customer> displayed. contentcontrol's calm is, say, an observablecollection<customer> template.

is illusory announce general form ilist xaml controlling {x:type} markup extension?