Using a Start/Begin Page from a Page Range

[Nath]

I'm trying to create a new style which uses only the start page. How
can I use this in my bibliography section which is currently:

<bibliography>
<option name="hanging-indent" value="true"/>

<sort>
<key macro="contributors"/>
<key variable="issued"/>
</sort>

<layout suffix=".">
<text macro="contributors" suffix="."/>
<text macro="date" prefix=" (" suffix=")"/>

<text macro="container-title" prefix=" " suffix="."/>
<text macro="locators"/>


<text variable="page" prefix=":"/>
</layout>
</bibliography>

Cheers,
Nath