The collection of option values in a multiple choice survey question.
<checkboxes> <dropdown> <listbox> <radiobuttons>
This is a collection property.
The following displays the value of optionvalue in a text stimulus:
<text sometext>
/ items= ("optionvalue = <% checkboxes.foo.optionvalue.1 %>")
</text>
The following displays the value of optionvalue in an instruction page:
<page somepage>
optionvalue = <% listbox.bar.optionvalue.1 %>
</page>