diff --git a/src/lib/osm/tags.test.ts b/src/lib/osm/tags.test.ts
new file mode 100644
index 0000000..6a54167
--- /dev/null
+++ b/src/lib/osm/tags.test.ts
@@ -0,0 +1,11 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { getTagStatus } from './tags';
+
+describe('The getTagStatus function', () => {
+  it('should return false/false for a tag that does NOT exist', () => {
+    expect(getTagStatus('whatever', {}, '', '')).toEqual({
+      selected: false,
+      highlighted: false,
+    });
+  });
+});
diff --git a/src/lib/osm/tags.ts b/src/lib/osm/tags.ts
new file mode 100644
index 0000000..9d35719
--- /dev/null
+++ b/src/lib/osm/tags.ts
@@ -0,0 +1,31 @@
+interface TagStatus {
+  selected: boolean;
+  highlighted: boolean;
+}
+
+interface TagFormatDefinition {}
+
+interface TagCategoryDefinitions {
+  [key: string]: TagFormatDefinition;
+}
+
+interface TagActivityDefinitions {
+  [key: string]: TagCategoryDefinitions;
+}
+
+interface TagDefinitions {
+  [key: string]: TagActivityDefinitions;
+}
+
+export const getTagStatus = (
+  tag: string,
+  definitions: TagDefinitions,
+  selectedKey: string,
+  highlightedKey: string
+) => {
+  let status: TagStatus = {
+    selected: false,
+    highlighted: false,
+  };
+  return status;
+};