Add xpath2json tool

Nice for local testing

xpath2json.py

@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+import sys, rich, libxml2
+
+if len(sys.argv) < 3:
+    print(f"Usage: {sys.argv[0]} XML_FILENAME XPATH", file=sys.stderr)
+    exit()
+
+try:
+    doc = libxml2.parseFile(sys.argv[1])
+    ctxt = doc.xpathNewContext()
+    res = ctxt.xpathEval(sys.argv[2])
+
+    out = [
+        dict(
+            node       = None if i.name in ("text", sys.argv[1]) else i.name,
+            xpath      = i.nodePath(),
+            data       = i.content,
+            content    = i.content, # /shrug
+            attributes = {child.name: child.content for child in i.properties} if i.properties is not None else {},
+        )
+        for e, i in enumerate(res)
+    ]
+    rich.print_json(data=out)
+
+finally:
+    doc.freeDoc()
+    ctxt.xpathFreeContext()