Max count?

I have some xml which looks like :-

<datanode>
        <column id="1">
                <line>text</line>
                <line>text</line>
        </column>
        <column id="2">
                <line>text</line>
                <line>text</line>
                <line>text</line>
        </column>
        <column id="3">
                <line>text</line>
        </column>
</datanode>

I need to retrieve the maximum number of line nodes contained by a
column node within the datanode node. So for the example xml it would be
3, as column 2 has three line nodes.

Can anyone give me any pointers?

Cheers,

Dan

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