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      <h1>The saxon:supply-source-locator attribute</h1>
      <p>This attribute is relevant only when output is sent to a user-written <code>ContentHandler</code>,
that is, a <code>SAXResult</code>. It causes extra information to be maintained and made available to
the <code>ContentHandler</code> for diagnostic purposes: specifically, the <code>Locator</code> that is
passed to the <code>ContentHandler</code> via the <code>setDocumentLocator</code> method may be cast to a
<code>ContentHandlerProxyLocator</code>, which exposes the method <code>getContextItemStack()</code>. This
returns a <code>java.util.Stack</code>. The top item on the stack is the current context item, and below this
are previous context items. Each item is represented by the interface <code>net.sf.saxon.om.Item</code>. If
the item is a node, and if the node is one derived by parsing a source document with the line-numbering
option enabled, then it is possible to obtain the URI and line number of this node in the original XML source.</p>
      <p>For this to work, the code must be compiled with tracing enabled. This can be achieved by setting the option
<code>config.setCompileWithTracing(true)</code> on the <code>Configuration</code> object, or equivalently by
setting the property <code>FeatureKeys.COMPILE_WITH_TRACING</code> on the JAXP <code>TransformerFactory</code>.
Note that this compile-time option imposes a substantial run-time overhead, even if tracing is not switched on
at run-time by providing a <code>TraceListener</code>.</p>
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