FO White space Handling

In the following example (from www.w3.org), should an XSL-FO processor
maintain the spacing at the end of 'Page ' in the static content of the
"page" page sequence? 

A reference from the specification would be great - I haven't had any
luck finding one.

Scott

----------------------------------------------------------------
...
      <fo:static-content flow-name="xsl-region-after">
        <fo:block>
          <xsl:text>Page </xsl:text>   
          <fo:page-number/>
        </fo:block>
      </fo:static-content>
...
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