diff --git a/examples/projects/valid/alma2lobid.json b/examples/project/valid/alma2lobid.json
similarity index 71%
rename from examples/projects/valid/alma2lobid.json
rename to examples/project/valid/alma2lobid.json
index 3fbdbfb0..3cd5fc6b 100644
--- a/examples/projects/valid/alma2lobid.json
+++ b/examples/project/valid/alma2lobid.json
@@ -1,7 +1,9 @@
 {
   "@context": "https://schema.org/",
   "id": "https://github.com/hbz/lobid-resources/milestone/1",
-  "type": "Project",
+  "type": [
+    "Project"
+  ],
   "name": {
     "de": "lobid/Alma-Migration",
     "en": "lobid/Alma Migration"
@@ -10,5 +12,10 @@
     "en": "Switch lobid-resources ETL and indexing from Aleph to Alma Marc21 XML",
     "de": "Umstieg von Aleph- auf Alma-MARC21-Daten bei Transformation und Indexierung für lobid-resources"
   },
-  "url": "https://github.com/hbz/lobid-resources/milestone/1"
+  "url": "https://github.com/hbz/lobid-resources/milestone/1",
+  "enhances": [
+    {
+      "id": "https://lobid.org"
+    }
+  ]
 }
\ No newline at end of file
diff --git a/examples/projects/valid/lrmi-profile.json b/examples/project/valid/lrmi-profile.json
similarity index 94%
rename from examples/projects/valid/lrmi-profile.json
rename to examples/project/valid/lrmi-profile.json
index a71487df..069d2357 100644
--- a/examples/projects/valid/lrmi-profile.json
+++ b/examples/project/valid/lrmi-profile.json
@@ -1,7 +1,9 @@
 {
   "@context": "https://schema.org/",
   "id": "https://github.com/dini-ag-kim/lrmi-profile",
-  "type": "Project",
+  "type": [
+    "Project"
+  ],
   "name": {
     "de": "LRMI-Metadatenprofil",
     "en": "LRMI Metadata Profile"
diff --git a/examples/project/valid/metafacture-fix.json b/examples/project/valid/metafacture-fix.json
new file mode 100644
index 00000000..c554abe4
--- /dev/null
+++ b/examples/project/valid/metafacture-fix.json
@@ -0,0 +1,21 @@
+{
+  "@context": "https://schema.org/",
+  "id": "https://github.com/metafacture/metafacture-fix",
+  "type": [
+    "Project"
+  ],
+  "name": {
+    "de": "Metafacture-Fix",
+    "en": "Metafacture-Fix"
+  },
+  "description": {
+    "en": "Implementation of the Fix language for Metafacture as an alternative to configuring data transformations with Metamorph",
+    "de": "Das Projekt entwickelt und implementiert FIX als Metafacture Sprache. Diese soll als Alternative zu Metamorph für Datentransformation eingesetzt werden."
+  },
+  "url": "https://github.com/metafacture/metafacture-fix",
+  "enhances": [
+    {
+      "id": "https://metafacture.org"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/examples/projects/valid/metafacture-playground.json b/examples/project/valid/metafacture-playground.json
similarity index 53%
rename from examples/projects/valid/metafacture-playground.json
rename to examples/project/valid/metafacture-playground.json
index 3a49459f..48268521 100644
--- a/examples/projects/valid/metafacture-playground.json
+++ b/examples/project/valid/metafacture-playground.json
@@ -1,13 +1,21 @@
 {
   "@context": "https://schema.org/",
   "id": "https://github.com/metafacture/metafacture-playground",
-  "type": "Project",
+  "type": [
+    "Project"
+  ],
   "name": {
     "de": "Metafacture Playground",
     "en": "Metafacture Playground"
   },
   "description": {
-    "en": "This projects aims to provide a web application to play around with Metafactures languages Fix and Flux."
+    "en": "This projects aims to provide a web application to play around with Metafactures languages Fix and Flux.",
+    "de": "Dieses Projekt entwickelt eine Web-Applikation, mit der man interaktiv die Metafacture-Sprachen Fix und Flux austesten kann."
   },
-  "url": "https://github.com/metafacture/metafacture-playground"
+  "url": "https://github.com/metafacture/metafacture-playground",
+  "enhances": [
+    {
+      "id": "https://metafacture.org"
+    }
+  ]
 }
\ No newline at end of file
diff --git a/examples/projects/valid/oersi.json b/examples/project/valid/oersi.json
similarity index 72%
rename from examples/projects/valid/oersi.json
rename to examples/project/valid/oersi.json
index f79a74bc..4c1488d9 100644
--- a/examples/projects/valid/oersi.json
+++ b/examples/project/valid/oersi.json
@@ -1,18 +1,22 @@
 {
   "@context": "https://schema.org/",
   "id": "https://oersi.de",
-  "type": "Project",
+  "type": [
+    "Project"
+  ],
   "name": {
     "de": "OER Search Index",
     "en": "OER Search Index"
   },
-  "alternateName": {
-    "de": "OERSI",
-    "en": "OERSI"
-  },
+  "alternateName": [
+    "OERSI"
+  ],
   "description": {
     "de": "Ein gemeinsames Projekt der TIB Hannover und des hbz zum Aufbau eines offenen Suchindex für Bildungsressourcen",
     "en": "Common project by TIB Hannover and hbz to create an open search index for educational resources"
   },
-  "url": "https://oersi.de"
+  "url": "https://oersi.de",
+  "isBasedOn": {
+    "id": "https://metafacture.org"
+  }
 }
\ No newline at end of file
diff --git a/examples/projects/valid/rpb.json b/examples/project/valid/rpb.json
similarity index 94%
rename from examples/projects/valid/rpb.json
rename to examples/project/valid/rpb.json
index d7a60fe9..e7df37ac 100644
--- a/examples/projects/valid/rpb.json
+++ b/examples/project/valid/rpb.json
@@ -1,7 +1,9 @@
 {
   "@context": "https://schema.org/",
   "id": "https://github.com/hbz/rpb",
-  "type": "Project",
+  "type": [
+    "Project"
+  ],
   "name": {
     "de": "Rheinland-Pfälzische Bibliographie",
     "en": "Bibliography of Rhineland-Platinate"
diff --git a/examples/projects/valid/metafacture-fix.json b/examples/projects/valid/metafacture-fix.json
deleted file mode 100644
index 6e51fd49..00000000
--- a/examples/projects/valid/metafacture-fix.json
+++ /dev/null
@@ -1,13 +0,0 @@
-{
-  "@context": "https://schema.org/",
-  "id": "https://github.com/metafacture/metafacture-fix",
-  "type": "Project",
-  "name": {
-    "de": "Metafacture-Fix",
-    "en": "Metafacture-Fix"
-  },
-  "description": {
-    "en": "Implementation of the Fix language for Metafacture as an alternative to configuring data transformations with Metamorph"
-  },
-  "url": "https://github.com/metafacture/metafacture-fix"
-}
\ No newline at end of file
diff --git a/schemas/enhances.json b/schemas/enhances.json
new file mode 100644
index 00000000..515f9742
--- /dev/null
+++ b/schemas/enhances.json
@@ -0,0 +1,20 @@
+{
+  "$id": "resource:/enhances.json",
+  "title": "product",
+  "description": "Schema to describe a product at lobid.",
+  "type": "array",
+  "items": {
+    "type": "object",
+    "properties": {
+      "id": {
+        "$ref": "resource:/id.json"
+      },
+      "name": {
+        "$ref": "resource:/name.json"
+      }
+    },
+    "required": [
+      "id"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/schemas/project.json b/schemas/project.json
new file mode 100644
index 00000000..d7482dde
--- /dev/null
+++ b/schemas/project.json
@@ -0,0 +1,49 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "$id": "resource:/project.json",
+  "title": "Project",
+  "description": "Schema to describe a project at lobid.",
+  "type": "object",
+  "properties": {
+    "id": {
+      "$ref": "resource:/id.json"
+    },
+    "type": {
+      "type": "array",
+      "items": {
+        "type": "string",
+        "const": "Project"
+      }
+    },
+    "alternateName": {
+      "$ref": "resource:/alternateName.json"
+    },
+    "description": {
+      "$ref": "resource:/description.json"
+    },
+    "name": {
+      "$ref": "resource:/name.json"
+    },
+    "image": {
+      "$ref": "resource:/image.json"
+    },
+    "startDate": {
+      "$ref": "resource:/startDate.json"
+    },
+    "endDate": {
+      "$ref": "resource:/endDate.json"
+    },
+    "enhances": {
+      "$ref": "resource:/enhances.json"
+    },
+    "membership": {
+      "$ref": "resource:/membership.json"
+    }
+  },
+  "required": [
+    "id",
+    "name",
+    "type",
+    "description"
+  ]
+}
\ No newline at end of file
diff --git a/test.sh b/test.sh
index 66401073..7411dcc5 100644
--- a/test.sh
+++ b/test.sh
@@ -10,6 +10,8 @@ ajv test -s schemas/group.json -r "schemas/*.json" -d "examples/group/valid/*.js
 ajv test -s schemas/group.json -r "schemas/*.json" -d "examples/group/invalid/*.json" --invalid
 ajv test -s schemas/publication.json -r "schemas/*.json" -d "examples/publication/valid/*.json" --valid
 ajv test -s schemas/publication.json -r "schemas/*.json" -d "examples/publication/invalid/*.json" --invalid
+ajv test -s schemas/project.json -r "schemas/*.json" -d "examples/project/valid/*.json" --valid
+ajv test -s schemas/project.json -r "schemas/*.json" -d "examples/project/invalid/*.json" --invalid
 
 if [ $? -eq 0 ]
 then