“XSLT filter duplicates” – Forum Thread – Discuss

XSLT filter duplicates

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- vladG
- 29 Jun 11, 6:41 pm
- Comment #1

Hi.

Let's say I have an XML like this:

<entries>
    <entry>
        <email handle="e1-site-com">e1@site.com</email>
    </entry>
    <entry>
        <email handle="e2-site-com">e2@site.com</email>
    </entry>
    <entry>
        <email handle="e5-site-com">e5@site.com</email>
    </entry>
    <entry>
        <email handle="e2-site-com">e2@site.com</email>
    </entry>
    <entry>
        <email handle="e4-site-com">e4@site.com</email>
    </entry>
    <entry>
        <email handle="e5-site-com">e5@site.com</email>
    </entry>
    <entry>
        <email handle="e2-site-com">e2@site.com</email>
    </entry>
</entries>

I need to list all emails without duplicates like this:

<li>e1@site.com</li>
<li>e2@site.com</li>
<li>e5@site.com</li>
<li>e4@site.com</li>

How can I filter out the duplicates?

Thank you.

- michael-e
- 29 Jun 11, 6:54 pm
- Comment #2

You might use keys and the generate-id() function, as described in this article. In the comments on this page there is also another interesting approach, writing the desired values to a variable:

<xsl:variable name="unique-list" select="//email[not(. = following::email)]" />

I haven't tested it, but it should work. Maybe some guru knows which method is faster?

- dingnz
- 29 Jun 11, 7:01 pm
- Comment #3

Try something like

<xsl:variable name="unique-list" 
    select="//email[not(.=following::email)]" />   
<xsl:for-each select="$unique-list">
    <xsl:value-of select="." />
 </xsl:for-each>

I haven't tried this though.

//EDIT: michael-e was faster than me I guess :)

- nickdunn
- 29 Jun 11, 7:03 pm
- Comment #4

Some other similar posts:

- vladG
- 29 Jun 11, 7:27 pm
- Comment #5

Thanks all for help.

@nick

Hmm, my mistake. I searched the forum only for xslt duplicates :)

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