Re: The output of evaluating an XSLT transform is the

Interesting stuff. One way to think of this may be in terms of OPs
initial example. Here's a take on it, which I present both as
explanation and for correction.

  <xsl:variable name="hw">
    <xsl:text>Hello</xsl:text>
    <xsl:text>World</xsl:text>
  </xsl:variable>
  <xsl:value-of select="$hw"/>

An XSLT processor should spit out the string "HelloWorld", but
whether it generates that string by

* take text node `Hello`
   take text node `World`, stick it *after* `Hello`

OR

* take text node `World`
   take text node `Hello`, stick it *before* `World`

is entirely up to the processor.

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