Select distinct elements

Hello,

I need to select events for text output, but only once each.
So the output should look like this:

11:00-14:00: Event 1
12:00-12:15: Event 2
15:00-15:30: Event 3

I don't know, how to select each event original, when the same event is in
input more times.

This is XML fragment:

<day dayName="4" day="15" month="2" year="2001">
    <hour time="08:00" />
    <hour time="09:00" />
    <hour time="10:00" />
    <hour time="11:00">
        <event>
            <name>Event 1</name>
            <oid>1</oid>
            <timeFrom>11:00</timeFrom>
            <timeTo>14:00</timeTo>
       </event>
    </hour>
    <hour time="12:00">
        <event>
            <name>Event 1</name>
            <oid>1</oid>
            <timeFrom>11:00</timeFrom>
            <timeTo>14:00</timeTo>
        </event>
        <event>
            <name>Event 2</name>
            <oid>2</oid>
            <timeFrom>12:00</timeFrom>
            <timeTo>12:15</timeTo>
        </event>
    </hour>
    <hour time="13:00">
        <event>
            <name>Event 1</name>
            <oid>1</oid>
            <timeFrom>11:00</timeFrom>
            <timeTo>14:00</timeTo>
        </event>
    </hour>
    <hour time="14:00" />
    <hour time="15:00">
        <event>
            <name>Event 3</name>
            <oid>3</oid>
            <timeFrom>15:00</timeFrom>
            <timeTo>15:30</timeTo>
        </event>
    </hour>
    <hour time="16:00" />
</day>

Thanks a lot,

regards

Jakub.


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