[xsl] Use of separator

Hi,

i have some trouble understanding the separator-attribute of value-of.
This is my template:

<xsl:template match="example">
  <helloWorld>
     <xsl:value-of select="element()/text()" separator=", "/>
  </helloWorld>
</xsl:template>

The element "example" contains several child-nodes with text. The
above expression gives the  expected values but without the separator
("TextTextText"). But if i change the value-of expression to this...

<xsl:value-of select="*" separator=", "/>

... i also get the values, now separated with commas ("Text, Text, Text").

Now i wonder why the result of the first expression contains no
separator while the other one does. Any explanations?

Georg.

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