diff --git a/ETL Editor.html b/ETL Editor.html
index 509be1c..ea63bb0 100644
--- a/ETL Editor.html	
+++ b/ETL Editor.html	
@@ -140,6 +140,12 @@
         .mappings-table th { font-size: 0.75rem; color: var(--text-secondary); }
         .mappings-table .form-control { font-size: 0.8rem; padding: 0.3rem 0.5rem; }
         .mappings-table td.actions { width: 1%; }
+        .tree-view { font-family: 'Fira Code', monospace; color: var(--text-primary); }
+        .tree-view ul { list-style: none; padding-left: 1rem; border-left: 1px solid var(--border); margin: 0.25rem 0; }
+        .tree-node { margin: 0.25rem 0; }
+        .tree-tag { color: var(--primary); }
+        .tree-attr { color: var(--secondary); }
+        .tree-text { color: var(--text-secondary); font-style: italic; }
     </style>
 </head>
 <body>
@@ -166,7 +172,7 @@
         </div>
         <div class="editor-container">
             <div class="tabs"><button class="tab active" onclick="switchTab('xml', event)">XML Output</button><button class="tab" onclick="switchTab('preview', event)">Tree View</button></div>
-            <div class="editor"><div id="xmlOutput"></div><div id="treeView" style="display: none;"></div></div>
+            <div class="editor"><div id="xmlOutput"></div><div id="treeView" class="tree-view" style="display: none;"></div></div>
         </div>
     </div>
 
@@ -214,13 +220,10 @@ <h2 class="modal-title">Edit Load</h2>
     </div>
     
     <script>
-        // No changes to the JavaScript are needed for this layout improvement.
-        // All existing functions from the previous step remain the same.
-        
         let targetData = { name: '', database: '', temporalization: '', loads: [] };
         let currentTab = 'xml';
 
-        function switchTab(tabName, event) { currentTab = tabName; document.querySelectorAll('.tab').forEach(t => t.classList.remove('active')); event.target.classList.add('active'); if (tabName === 'xml') { document.getElementById('xmlOutput').style.display = 'block'; document.getElementById('treeView').style.display = 'none'; updateXML(); } else { document.getElementById('xmlOutput').style.display = 'none'; document.getElementById('treeView').style.display = 'block'; document.getElementById('treeView').innerHTML = "Tree view not implemented."; } }
+        function switchTab(tabName, event) { currentTab = tabName; document.querySelectorAll('.tab').forEach(t => t.classList.remove('active')); event.target.classList.add('active'); if (tabName === 'xml') { document.getElementById('xmlOutput').style.display = 'block'; document.getElementById('treeView').style.display = 'none'; updateXML(); } else { document.getElementById('xmlOutput').style.display = 'none'; document.getElementById('treeView').style.display = 'block'; updateXML(); } }
         function newFile() { if (confirm('Create a new file? Current changes will be lost.')) { targetData = { name: '', database: '', temporalization: '', loads: [] }; document.getElementById('targetName').value = ''; document.getElementById('targetDatabase').value = ''; document.getElementById('temporalization').value = ''; updateLoadsList(); updateXML(); } }
         function loadFile(event) { const file = event.target.files[0]; if (file) { const reader = new FileReader(); reader.onload = function(e) { parseXML(e.target.result); }; reader.readAsText(file); } }
         function parseXML(xmlText) { const parser = new DOMParser(); const xmlDoc = parser.parseFromString(xmlText, "text/xml"); const target = xmlDoc.querySelector("target"); if (target) { targetData.name = target.getAttribute("name") || ""; targetData.database = target.getAttribute("database") || ""; targetData.temporalization = target.getAttribute("temporalization") || ""; document.getElementById("targetName").value = targetData.name; document.getElementById("targetDatabase").value = targetData.database; document.getElementById("temporalization").value = targetData.temporalization; targetData.loads = []; const loads = target.querySelectorAll("load"); loads.forEach(load => { const loadObj = { source: load.getAttribute("source") || "", target: load.getAttribute("target") || "", anchor: load.getAttribute("anchor") || "", type: load.getAttribute("type") || "", pass: load.getAttribute("pass") || "", sqlBefore: "", sqlAfter: "", selectStatement: "", mappings: [] }; const sqlElements = load.querySelectorAll("sql"); sqlElements.forEach(sql => { const position = sql.getAttribute("position"); if (position === "before") { loadObj.sqlBefore = sql.textContent.trim(); } else if (position === "after") { loadObj.sqlAfter = sql.textContent.trim(); } }); const textNodes = Array.from(load.childNodes).filter(node => node.nodeType === 3 && node.textContent.trim()); if (textNodes.length > 0) { loadObj.selectStatement = textNodes.map(n => n.textContent).join("\n").trim(); } const maps = load.querySelectorAll("map"); maps.forEach(map => { loadObj.mappings.push({ source: map.getAttribute("source") || "", target: map.getAttribute("target") || "", as: map.getAttribute("as") || "", attribute: map.getAttribute("attribute") || "", deletable: map.getAttribute("deletable") === "true" }); }); targetData.loads.push(loadObj); }); updateLoadsList(); updateXML(); } }
@@ -236,11 +239,13 @@ <h2 class="modal-title">Edit Load</h2>
         function removeLoad(index) { if (confirm('Are you sure you want to remove this load?')) { targetData.loads.splice(index, 1); updateLoadsList(); updateXML(); } }
         function updateLoadsList() { const tbody = document.getElementById('loadsList'); tbody.innerHTML = ''; if (targetData.loads.length === 0) { tbody.innerHTML = `<tr><td colspan="7" style="text-align: center; padding: 2rem; color: var(--text-secondary);">No loads defined. Click 'Add Load' to get started.</td></tr>`; return; } targetData.loads.forEach((load, index) => { const tr = document.createElement('tr'); tr.innerHTML = `<td>${escapeHtml(load.source)}</td><td>${escapeHtml(load.target)}</td><td>${load.type ? `<span style="background:var(--primary);color:white;padding:2px 6px;border-radius:4px;font-size:0.7rem;">${load.type.toUpperCase()}</span>` : 'Default'}</td><td>${escapeHtml(load.anchor || 'N/A')}</td><td>${escapeHtml(load.pass || 'N/A')}</td><td>${load.mappings ? load.mappings.length : 0}</td><td class="actions"><button class="btn-icon" onclick="editLoad(${index})" title="Edit Load">✏️</button><button class="btn-icon btn-danger" onclick="removeLoad(${index})" title="Remove Load">🗑️</button></td>`; tbody.appendChild(tr); }); }
         function generateXML() { targetData.name = document.getElementById('targetName').value; targetData.database = document.getElementById('targetDatabase').value; targetData.temporalization = document.getElementById('temporalization').value; let xml = `<target name="${targetData.name}" database="${targetData.database}"`; if (targetData.temporalization) { xml += ` temporalization="${targetData.temporalization}"`; } xml += '>\n'; targetData.loads.forEach(load => { xml += `    <load source="${load.source}" target="${load.target}"`; if (load.anchor) xml += ` anchor="${load.anchor}"`; if (load.type) xml += ` type="${load.type}"`; if (load.pass) xml += ` pass="${load.pass}"`; xml += '>\n'; if (load.sqlBefore) { xml += `        <sql position="before"><![CDATA[\n${load.sqlBefore}\n        ]]></sql>\n`; } if (load.mappings && load.mappings.length > 0) { load.mappings.forEach(map => { xml += `        <map source="${map.source}" target="${map.target}"`; if (map.as) xml += ` as="${map.as}"`; if (map.attribute) xml += ` attribute="${map.attribute}"`; xml += '/>\n'; }); } if (load.selectStatement) { xml += `        <![CDATA[\n${load.selectStatement}\n        ]]>\n`; } if (load.sqlAfter) { xml += `        <sql position="after"><![CDATA[\n${load.sqlAfter}\n        ]]></sql>\n`; } xml += '    </load>\n'; }); xml += '</target>'; return xml; }
-        function updateXML() { const rawXml = generateXML(); document.getElementById('xmlOutput').innerHTML = syntaxHighlightXML(rawXml); }
+        function updateXML() { const rawXml = generateXML(); document.getElementById('xmlOutput').innerHTML = syntaxHighlightXML(rawXml); if (currentTab === 'preview') { updateTreeView(rawXml); } }
         function downloadXML() { const xml = generateXML(); const blob = new Blob([xml], { type: 'application/xml' }); const url = URL.createObjectURL(blob); const a = document.createElement('a'); a.href = url; a.download = `${targetData.name || 'output'}.xml`; document.body.appendChild(a); a.click(); document.body.removeChild(a); URL.revokeObjectURL(url); }
         function escapeHtml(text) { return text ? text.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/"/g, "&quot;").replace(/'/g, "&#039;") : ''; }
         function syntaxHighlightXML(xml) { let escaped = escapeHtml(xml); return escaped.replace(/(&lt;!\[CDATA\[|\]\]&gt;)/g, '<span style="color:var(--text-secondary); font-style: italic;">$&</span>').replace(/(&lt;\??)(\/?\w+)/g, '<span class="xml-tag">$1$2</span>').replace(/(\w+)=(&quot;.*?&quot;)/g, '<span class="xml-attr-name">$1</span>=<span class="xml-attr-value">$2</span>'); }
+        function updateTreeView(rawXml) { const container = document.getElementById('treeView'); const parser = new DOMParser(); const doc = parser.parseFromString(rawXml, "application/xml"); if (doc.querySelector('parsererror')) { container.innerHTML = '<div class="tree-text">Unable to render tree view.</div>'; return; } container.innerHTML = ''; const rootList = document.createElement('ul'); rootList.appendChild(createTreeNode(doc.documentElement)); container.appendChild(rootList); }
+        function createTreeNode(node) { const li = document.createElement('li'); const attrs = Array.from(node.attributes || []).map(attr => `<span class="tree-attr">${escapeHtml(attr.name)}</span>="${escapeHtml(attr.value)}"`).join(' '); const labelParts = [`<span class="tree-tag">${escapeHtml(node.nodeName)}</span>`]; if (attrs) { labelParts.push(attrs); } li.innerHTML = `<div class="tree-node">${labelParts.join(' ')}</div>`; const children = Array.from(node.childNodes).filter(child => child.nodeType === 1 || (child.nodeType === 3 && child.textContent.trim())); if (children.length) { const ul = document.createElement('ul'); children.forEach(child => { if (child.nodeType === 1) { ul.appendChild(createTreeNode(child)); } else { const textLi = document.createElement('li'); textLi.innerHTML = `<div class="tree-text">${escapeHtml(child.textContent.trim())}</div>`; ul.appendChild(textLi); } }); li.appendChild(ul); } return li; }
         window.onload = function() { updateXML(); updateLoadsList(); }
     </script>
 </body>
-</html>```
\ No newline at end of file
+</html>```
