[xsl] Not-repeated elements in an <xsl:for-each>

Subject: [xsl] Not-repeated elements in an <xsl:for-each>
From: "Caranthir Morifinwë" <caranthir@xxxxxxxxxxxx>
Date: Mon, 22 Dec 2003 00:48:07 +0100 (Hora estándar romance)
I wonder if there is some way to get a list of nodes without repeated
elements, something similitar to de "DISTINCT" clausule in a SELECT sentence
of SQL. I need to do this because i want to show the total sum of many
attributes from many elements. There is an example xml:

    <ship type="astropod" num="100"/>
    <ship type="spider" num="150"/>
    <ship type="astropod" num="50"/>

If I use the following XSL template:

<xsl:template match="/root">
    <xsl:for-each select=ship/@type>
        <xsl:variable name="stype" select="."/>
        <xsl:value-of select="sum(/root/ship[@type=stype]/@num)"/>

i get "150 150 150", repeating the third ship who has the same type than first. Is there any way to only get one "astropod" type in the list xsl:for-each iterates?

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