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            <fo:block font-size="16pt" font-weight="bold" font-family="Helvetica" space-before.minimum="1em" space-before.optimum="1.5em" space-before.maximum="2em">Loops</fo:block>
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<fo:wrapper id="id2766444"><!--for loop, DSSSL and--></fo:wrapper>
<fo:wrapper id="id2766461"><!--loops, implementing (DSSSL)--></fo:wrapper>
<fo:wrapper id="id2766477"><!--tail recursion (DSSSL)--></fo:wrapper>
DSSSL doesn't have any construct that resembles the
for loop that occurs in most imperative languages like C
and Java. Instead, DSSSL employs a common trick in
functional languages for implementing a loop: tail recursion.
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Loops in DSSSL use a special form of
<fo:inline font-family="Courier">let</fo:inline>. This loop counts from 1 to 10:
<fo:block wrap-option="no-wrap" text-align="start" white-space-collapse="false" linefeed-treatment="preserve" font-family="Courier" font-size="9pt">
(let <fo:inline id="dl1">&#x2776;</fo:inline>loopvar <fo:inline id="dl2">&#x2777;</fo:inline>((count 1))
  <fo:inline id="dl3">&#x2778;</fo:inline>(if (&gt; count 10)
    <fo:inline id="dl4">&#x2779;</fo:inline>#t
    (<fo:inline id="dl5">&#x277A;</fo:inline>loopvar <fo:inline id="dl6">&#x277B;</fo:inline>(+ count 1))))</fo:block></fo:block>
      <fo:block id="id2882068">
        <fo:list-block space-before.optimum="1em" space-before.minimum="0.8em" space-before.maximum="1.2em" provisional-distance-between-starts="2.2em" provisional-label-separation="0.2em">
          <fo:list-item id="id2882047">
            <fo:list-item-label end-indent="label-end()">
              <fo:block>&#x2776;</fo:block>
            </fo:list-item-label>
            <fo:list-item-body start-indent="body-start()">
              <fo:block>This variable controls the loop. It is declared without an
initial value, immediately after the <fo:inline font-family="Courier">let</fo:inline>
operand.</fo:block>
            </fo:list-item-body>
          </fo:list-item>
          <fo:list-item id="id2761001">
            <fo:list-item-label end-indent="label-end()">
              <fo:block>&#x2777;</fo:block>
            </fo:list-item-label>
            <fo:list-item-body start-indent="body-start()">
              <fo:block>
<fo:wrapper id="id2882027"><!--variables (DSSSL), local, defining after loop variable--></fo:wrapper>
Any number of additional local variables can be defined after
the loop variable, just as they can in any other
<fo:inline font-family="Courier">let</fo:inline> expression.</fo:block>
            </fo:list-item-body>
          </fo:list-item>
          <fo:list-item id="id2855821">
            <fo:list-item-label end-indent="label-end()">
              <fo:block>&#x2778;</fo:block>
            </fo:list-item-label>
            <fo:list-item-body start-indent="body-start()">
              <fo:block>If you ever want the loop to end, you have to put some sort of a
test in it.</fo:block>
            </fo:list-item-body>
          </fo:list-item>
          <fo:list-item id="id2882029">
            <fo:list-item-label end-indent="label-end()">
              <fo:block>&#x2779;</fo:block>
            </fo:list-item-label>
            <fo:list-item-body start-indent="body-start()">
              <fo:block>This is the value that will be returned.</fo:block>
            </fo:list-item-body>
          </fo:list-item>
          <fo:list-item id="id2763042">
            <fo:list-item-label end-indent="label-end()">
              <fo:block>&#x277A;</fo:block>
            </fo:list-item-label>
            <fo:list-item-body start-indent="body-start()">
              <fo:block>Note that you iterate the loop by using the loop variable as if
it was a function name.</fo:block>
            </fo:list-item-body>
          </fo:list-item>
          <fo:list-item id="id2763077">
            <fo:list-item-label end-indent="label-end()">
              <fo:block>&#x277B;</fo:block>
            </fo:list-item-label>
            <fo:list-item-body start-indent="body-start()">
              <fo:block>The arguments to this function are the values that
you want the local variables declared in <fo:basic-link internal-destination="dl2">&#x2777;</fo:basic-link> to have
in the next iteration.</fo:block>
            </fo:list-item-body>
          </fo:list-item>
        </fo:list-block>
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