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      <h1>Changes to Saxon extensions and extensibility mechanisms</h1>
      <p>An additional flag is provided for <code>saxon:deep-equal()</code>: the <code>I</code> flag tests whether the
    <code>is-ID</code> and <code>is-IDREF</code> properties of two nodes match.</p>
      <p>To allow XSLT extension instructions to be called from generated bytecode, the interface has been changed: evaluation
            must now be done using the standard <code>call</code> method, which is aligned with the interface for integrated
            extension functions. For examples, see the source code of the SQL extension classes.</p>
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