diff --git a/.github/workflows/check-json.yml b/.github/workflows/check-json.yml
index ccd8e55..ecea4be 100644
--- a/.github/workflows/check-json.yml
+++ b/.github/workflows/check-json.yml
@@ -25,5 +25,19 @@ jobs:
         uses: limitusus/json-syntax-check@v2
         with:
           pattern: "\\.json$"
-      - name: Check Actions Schema
-        run: python -c 'import yaml,json,jsonschema,sys;jsonschema.validate(yaml.load(open(sys.argv[1]), yaml.Loader), json.load(open(sys.argv[2])))' fileformats.yml fileformats.schema.json
\ No newline at end of file
+      - name: Check JSON Schemata
+        run: |
+          for schema in *.schema.json; do
+            if [[ -f "${schema%.schema.json}.json" ]]; then
+              python3 -c 'import json,jsonschema,sys;jsonschema.validate(json.load(open(sys.argv[1])), json.load(open(sys.argv[2])))' "${schema%.schema.json}.json" "$schema";
+            fi;
+          done
+      - name: Check YAML Schemata
+        run: |
+          for schema in *.schema.json; do
+            for ext in "yaml" "yml"; do
+              if [[ -f "${schema%.schema.json}.$ext" ]]; then
+                python3 -c 'import yaml,json,jsonschema,sys;jsonschema.validate(yaml.load(open(sys.argv[1]), yaml.Loader), json.load(open(sys.argv[2])))' "${schema%.schema.json}.$ext" "$schema";
+              fi;
+            done
+          done
\ No newline at end of file
diff --git a/custom_signatures.schema.json b/custom_signatures.schema.json
new file mode 100644
index 0000000..b9a2c4d
--- /dev/null
+++ b/custom_signatures.schema.json
@@ -0,0 +1,51 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "actions",
+  "type": "array",
+  "items": {
+    "type": "object",
+    "additionalProperties": false,
+    "dependencies": {
+      "operator": [
+        "bof",
+        "eof"
+      ]
+    },
+    "if": {
+      "required": [
+        "bof",
+        "eof"
+      ]
+    },
+    "then": {
+      "required": [
+        "operator"
+      ]
+    },
+    "properties": {
+      "bof": {
+        "type": "string"
+      },
+      "eof": {
+        "type": "string"
+      },
+      "operator": {
+        "type": "string",
+        "enum": [
+          "AND",
+          "OR",
+          "XOR"
+        ]
+      },
+      "puid": {
+        "type": "string"
+      },
+      "signature": {
+        "type": "string"
+      },
+      "extension": {
+        "type": "string"
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/fileformats.schema.json b/fileformats.schema.json
index b7d8aad..e30373f 100644
--- a/fileformats.schema.json
+++ b/fileformats.schema.json
@@ -2,13 +2,76 @@
   "$schema": "https://json-schema.org/draft/2020-12/schema",
   "$id": "actions",
   "type": "object",
+  "additionalProperties": false,
   "patternProperties": {
-    ".*": {
+    "^[a-zA-Z0-9_/-]+$": {
       "type": "object",
       "required": [
         "name",
         "action"
       ],
+      "oneOf": [
+        {
+          "properties": {
+            "action": {
+              "const": "convert"
+            }
+          },
+          "required": [
+            "convert"
+          ]
+        },
+        {
+          "properties": {
+            "action": {
+              "const": "extract"
+            }
+          },
+          "required": [
+            "extract"
+          ]
+        },
+        {
+          "properties": {
+            "action": {
+              "const": "manual"
+            }
+          },
+          "required": [
+            "manual"
+          ]
+        },
+        {
+          "properties": {
+            "action": {
+              "const": "rename"
+            }
+          },
+          "required": [
+            "rename"
+          ]
+        },
+        {
+          "properties": {
+            "action": {
+              "const": "ignore"
+            }
+          },
+          "required": [
+            "ignore"
+          ]
+        },
+        {
+          "properties": {
+            "action": {
+              "const": "reidentify"
+            }
+          },
+          "required": [
+            "reidentify"
+          ]
+        }
+      ],
       "properties": {
         "name": {
           "type": "string"