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      <h1>Z</h1>
      <p class="subhead">ZERO</p>
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         <a class="bodylink" href="../functions/intro/fold-left.xml">fold-left($f as function(item()*, item()) as item()*, $zero as item()*, $seq as item()*) &#8594; item()*</a>
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         <a class="bodylink" href="../functions/intro/fold-right.xml">fold-right($f as function(item(), item()*) as item()*, $zero as item()*, $seq as item()*) &#8594; item()*</a>
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         <a class="bodylink" href="../functions/intro/sum.xml">sum($arg as xs:anyAtomicType*, $zero as xs:anyAtomicType?) &#8594; xs:anyAtomicType?</a>
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      <p class="subhead">ZERO-OR-ONE</p>
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         <a class="bodylink" href="../functions/intro/zero-or-one.xml">zero-or-one</a>
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         <a class="bodylink" href="../functions/intro/zero-or-one.xml">zero-or-one($arg as item()*) &#8594; item()?</a>
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