<author>
<first>Priscilla</first>
<last>Walmsley</last>
</author>
<xsl:value-of select="author" separator=" "/>
Here you select a sequence of one item, so there is nothing to join.
<xsl:value-of select="author/first,author/last"/>
produces
'Priscilla Walmsley'.
Here you select a sequence of 2 items, which are joined using the
default separator of a space.
The reason is xsl:value-of only ever adds a single text node to the
result tree, but its select attribute can return a sequence of
multiple items, so the separator is used to join the string value of
the items into a single string (just like string-join())
--
Andrew Welch
http://andrewjwelch.com
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