diff -r 12e8b65146d9 -r aff5d3498f68 cubicweb/web/test/data/cubicweb_tag/schema.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cubicweb/web/test/data/cubicweb_tag/schema.py	Tue Mar 19 13:17:47 2019 +0100
@@ -0,0 +1,17 @@
+from yams.buildobjs import EntityType, String, SubjectRelation, RelationType
+
+
+class Tag(EntityType):
+    """tags are used by users to mark entities.
+    When you include the Tag entity, all application specific entities
+    may then be tagged using the "tags" relation.
+    """
+    name = String(required=True, fulltextindexed=True, unique=True,
+                  maxsize=128)
+    # when using this component, add the Tag tag X relation for each type that
+    # should be taggeable
+    tags = SubjectRelation('Tag', description="tagged objects")
+
+
+class tags(RelationType):
+    """indicates that an entity is classified by a given tag"""