diff --git a/src/exporters/graphmlExporter.ts b/src/exporters/graphmlExporter.ts
new file mode 100644
index 0000000..bd61199
--- /dev/null
+++ b/src/exporters/graphmlExporter.ts
@@ -0,0 +1,126 @@
+import * as fs from 'fs';
+import { DependencyGraph, GraphNode, GraphEdge, ExportOptions } from '../types';
+
+export class GraphMLExporter {
+  private graph: DependencyGraph;
+  private options: Required<ExportOptions>;
+
+  constructor(graph: DependencyGraph, options: ExportOptions) {
+    this.graph = graph;
+    this.options = {
+      format: options.format,
+      outputPath: options.outputPath,
+      includeMetadata: options.includeMetadata ?? false,
+      layout: options.layout ?? 'dot',
+      rankDir: options.rankDir ?? 'TB'
+    };
+  }
+
+  export(): string {
+    const lines: string[] = [];
+
+    lines.push('<?xml version="1.0" encoding="UTF-8"?>');
+    lines.push('<graphml xmlns="http://graphml.graphdrawing.org/xmlns">');
+    lines.push('  <key id="d0" for="node" attr.name="label" attr.type="string"/>');
+    lines.push('  <key id="d1" for="node" attr.name="kind" attr.type="string"/>');
+    lines.push('  <key id="d2" for="node" attr.name="filePath" attr.type="string"/>');
+    lines.push('  <key id="d3" for="node" attr.name="lineNumber" attr.type="int"/>');
+    lines.push('  <key id="d4" for="edge" attr.name="style" attr.type="string"/>');
+    lines.push('  <key id="d5" for="edge" attr.name="label" attr.type="string"/>');
+    lines.push('');
+    lines.push('  <graph id="G" edgedefault="directed">');
+
+    if (this.options.includeMetadata) {
+      lines.push(`    <data key="d6">${this.escapeXml(this.graph.metadata.createdAt)}</data>`);
+      lines.push(`    <data key="d7">${this.graph.metadata.nodeCount}</data>`);
+      lines.push(`    <data key="d8">${this.graph.metadata.edgeCount}</data>`);
+    }
+
+    for (const node of this.graph.nodes.values()) {
+      this.writeNode(lines, node);
+    }
+
+    for (const edge of this.graph.edges) {
+      this.writeEdge(lines, edge);
+    }
+
+    lines.push('  </graph>');
+    lines.push('</graphml>');
+
+    return lines.join('\n');
+  }
+
+  private writeNode(lines: string[], node: GraphNode): void {
+    const nodeId = this.getNodeId(node.id);
+
+    lines.push(`    <node id="${nodeId}">`);
+    lines.push(`      <data key="d0">${this.escapeXml(node.label)}</data>`);
+    lines.push(`      <data key="d1">${this.escapeXml(node.kind)}</data>`);
+    lines.push(`      <data key="d2">${this.escapeXml(node.filePath)}</data>`);
+    lines.push(`      <data key="d3">${node.lineNumber}</data>`);
+
+    for (const [key, value] of Object.entries(node.metadata)) {
+      if (typeof value === 'string') {
+        lines.push(`      <data key="${this.getDataKey(key)}">${this.escapeXml(value)}</data>`);
+      } else if (typeof value === 'number') {
+        lines.push(`      <data key="${this.getDataKey(key)}">${value}</data>`);
+      } else if (typeof value === 'boolean') {
+        lines.push(`      <data key="${this.getDataKey(key)}">${value}</data>`);
+      }
+    }
+
+    lines.push('    </node>');
+  }
+
+  private writeEdge(lines: string[], edge: GraphEdge): void {
+    const sourceId = this.getNodeId(edge.source);
+    const targetId = this.getNodeId(edge.target);
+
+    lines.push(`    <edge source="${sourceId}" target="${targetId}">`);
+
+    if (edge.style) {
+      lines.push(`      <data key="d4">${this.escapeXml(edge.style)}</data>`);
+    }
+
+    if (edge.label) {
+      lines.push(`      <data key="d5">${this.escapeXml(edge.label)}</data>`);
+    }
+
+    if (edge.weight !== undefined) {
+      lines.push(`      <data key="${this.getDataKey('weight')}">${edge.weight}</data>`);
+    }
+
+    lines.push('    </edge>');
+  }
+
+  private getNodeId(id: string): string {
+    return `n${id.replace(/[^a-zA-Z0-9]/g, '_')}`;
+  }
+
+  private getDataKey(key: string): string {
+    const keyMap: Record<string, string> = {
+      weight: 'd9',
+      dependencies: 'd10'
+    };
+    return keyMap[key] || 'd9';
+  }
+
+  private escapeXml(str: string): string {
+    return str
+      .replace(/&/g, '&amp;')
+      .replace(/</g, '&lt;')
+      .replace(/>/g, '&gt;')
+      .replace(/"/g, '&quot;')
+      .replace(/'/g, '&apos;');
+  }
+
+  toFile(): void {
+    const content = this.export();
+    fs.writeFileSync(this.options.outputPath, content, 'utf-8');
+  }
+}
+
+export function exportToGraphML(graph: DependencyGraph, options: ExportOptions): string {
+  const exporter = new GraphMLExporter(graph, options);
+  return exporter.export();
+}