diff --git a/doc/parser.drawio b/doc/parser.drawio
new file mode 100644
index 0000000..55abda2
--- /dev/null
+++ b/doc/parser.drawio
@@ -0,0 +1,10 @@
+<mxfile host="Electron" modified="2023-10-28T11:03:56.535Z" agent="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) draw.io/22.0.3 Chrome/114.0.5735.289 Electron/25.8.4 Safari/537.36" etag="yo2-M30fcjtGDqpgnwIZ" version="22.0.3" type="device">
+  <diagram name="Page-1" id="gEWBz0x4ll_al-LDRKTk">
+    <mxGraphModel dx="1410" dy="826" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="850" pageHeight="1100" math="0" shadow="0">
+      <root>
+        <mxCell id="0" />
+        <mxCell id="1" parent="0" />
+      </root>
+    </mxGraphModel>
+  </diagram>
+</mxfile>