diff --git a/justfile b/justfile
index 9be2689..850a6a1 100644
--- a/justfile
+++ b/justfile
@@ -111,6 +111,10 @@ lookup-ref-ex:
 pronom:
  python jsonid.py --pronom --debug
 
+# PRONOM demo
+pronom-example:
+ python json2pronom.py -p pronom_example/patterns_example.json
+
 # move pronom to .droid folder
 pronom-to-droid:
  ~/.droid6/clean.sh
@@ -128,3 +132,7 @@ roy:
 droid-cli path: pronom-to-droid
  java -jar ~/dp/droid/droid-binary-6.8.0-bin/droid-command-line-6.8.0.jar -s 1
  java -jar ~/dp/droid/droid-binary-6.8.0-bin/droid-command-line-6.8.0.jar -ri  {{path}}
+
+# inspect prronom
+inspect-pro:
+ bat jsonid_pronom.xml
diff --git a/src/jsonid/export.py b/src/jsonid/export.py
index 7164a0c..c8d7371 100644
--- a/src/jsonid/export.py
+++ b/src/jsonid/export.py
@@ -21,6 +21,7 @@
 
 
 PRONOM_FILENAME: Final[str] = "jsonid_pronom.xml"
+JSON_PUID: Final[str] = "fmt/817"
 
 
 class PRONOMException(Exception):
@@ -77,7 +78,7 @@ def export_pronom() -> None:
             increment_id += 1
             fmt = pronom.Format(
                 id=increment_id,
-                name=f"JSON (Baseline - fmt/817) ({encoding})",
+                name=f"JSON (Baseline - {JSON_PUID}) ({encoding})",
                 version="",
                 puid="jsonid:0000",
                 mime="application/json",
diff --git a/src/jsonid/pronom.py b/src/jsonid/pronom.py
index 5a279df..64fc011 100644
--- a/src/jsonid/pronom.py
+++ b/src/jsonid/pronom.py
@@ -12,14 +12,15 @@
 from typing import Any, Final
 
 try:
+    import export
     import export_helpers
     import helpers
     import registry_matchers
 except ModuleNotFoundError:
     try:
-        from src.jsonid import export_helpers, helpers, registry_matchers
+        from src.jsonid import export, export_helpers, helpers, registry_matchers
     except ModuleNotFoundError:
-        from jsonid import export_helpers, helpers, registry_matchers
+        from jsonid import export, export_helpers, helpers, registry_matchers
 
 
 logger = logging.getLogger(__name__)
@@ -234,9 +235,19 @@ def create_file_format_collection(fmt: list[Format]):
         for sig in fmt.external_signatures
         if sig.type.lower() == EXT
     ]
+
+    priority_ids = []
+    for id_ in fmt.priorities:
+        if id_ == str(fmt.id):
+            continue
+        if export.JSON_PUID in fmt.name:
+            # This is brittle. Understand how to make more robust.
+            continue
+        priority_ids.append(id_)
+
     priorities = [
         f"<HasPriorityOverFileFormatID>{priority}</HasPriorityOverFileFormatID>"
-        for priority in fmt.priorities
+        for priority in priority_ids
     ]
     ff = f"""
 <FileFormat ID=\"{fmt.id}\" Name=\"{fmt.name}\" PUID=\"{fmt.puid}\" Version="{fmt.version}" MIMEType=\"{fmt.mime}\" FormatType=\"{fmt.classification}\" >