diff --git a/js/pjxml.js b/js/pjxml.js
index da90f5c..baddac4 100644
--- a/js/pjxml.js
+++ b/js/pjxml.js
@@ -398,19 +398,28 @@ var pjXML = (function () {
     if (typeof xpath === 'function') {
       const ar = [];
 
-      function safWorker(nd) {
-        if (xpath(nd)) {
+      function safWorker(nd, xpath, depth) {
+        const res = xpath(nd);
+
+        if (typeof res === 'function') {
+          xpath = res;
+          depth = 2;
+        } else if (res) {
           ar.push(nd);
+        } else if (res === null) {
+          depth = 1;
         }
 
-        const el = nd.elements();
+        if (--depth) {
+          const el = nd.elements();
 
-        for (let i = 0; i < el.length; i++) {
-          safWorker(el[i]);
+          for (let i = 0; i < el.length; i++) {
+            safWorker(el[i], xpath, depth);
+          }
         }
       }
 
-      safWorker(this);
+      safWorker(this, xpath, 0);
 
       return ar;
     }
diff --git a/nested-lambda-demo.html b/nested-lambda-demo.html
new file mode 100644
index 0000000..e5a03e6
--- /dev/null
+++ b/nested-lambda-demo.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+
+<script src='js/pjxml.js'></script>
+
+<script>
+function parsexml(text)
+{
+    const doc = pjXML.parse(text);
+    const paragraphs = document.getElementsByTagName("p");
+    for (var i = 0; i < paragraphs.length; ++i)
+    {
+        const val = paragraphs[i].id;
+        const key = isNaN(val) ? "name" : "number";
+        paragraphs[i].innerText = doc.selectAll(
+            r => !(r.name == "score-partwise") ? false :
+            r => !(r.name == "part") ? false :
+            r => !(r.name == "measure") ? false :
+            r => !(r.name == "note") ? false :
+            r => !(r.name == "lyric" && r.attributes[key] == val) ? false :
+            r => r.name == "text").map(node => node.text()).join(" | ");
+    }
+    content.innerText = text;
+}
+
+function filechange()
+{
+    const reader = new FileReader();
+    reader.addEventListener("load", () => parsexml(reader.result));
+    reader.readAsText(xml.files.item(0));
+}
+</script>
+
+<h3>Demo on parsing MusicXML with pjXML using nested lambdas</h3>
+<h4>Usage: Download <a href='https://lilypond.org/doc/v2.25/input/regression/musicxml/71/lily-1941d34e.xml'>lily-1941d34e.xml</a> and drop it into the below file input field.</h4>
+<input type='file' id='xml' onchange='filechange()'>
+<hr><p id='1'></p>
+<hr><p id='2'></p>
+<hr><p id='Verse'></p>
+<hr><p id='Chorus'></p>
+<hr><pre id='content'></pre>
