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      <h1>Streaming in XSLT</h1>
      <p>Many more constructs are now acceptable in streaming templates. For full details see 
                  <a class="bodylink" href="../../sourcedocs/streaming/streaming-templates.xml">Streaming Templates</a>.</p>
      <p>Explicit support for streaming is available for the functions <code>data()</code>, <code>avg()</code>, <code>count()</code>, 
                  <code>distinct-values()</code>, <code>empty()</code>, <code>exists()</code>, <code>min()</code>, <code>max()</code>, <code>string()</code>,
    <code>string-join()</code>, <code>sum()</code>; for the operators "," and the <code>(= | != | &lt;= | &lt; | &gt;= | &gt;)</code> family, 
    and for the instructions <code>xsl:attribute</code>, <code>xsl:apply-imports</code>, <code>xsl:apply-templates</code>,
    <code>xsl:choose</code>, <code>xsl:comment</code>, <code>xsl:copy</code>, <code>xsl:copy-of</code>, <code>xsl:document</code>, 
                 <code>xsl:element</code>, <code>xsl:for-each</code>, <code>xsl:iterate</code>, <code>xsl:result-document</code>. Implicit support
    is available for all functions and operators that process singleton items, and for many functions and instructions that operate on sequences
    - such as <code>subsequence()</code> 
    and <code>xsl:for-each-group</code> - with the caveat that their input is buffered in memory. </p>
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