diff --git a/application/src/Entity/Attribut/SlugAttribut.php b/application/src/Entity/Attribut/SlugAttribut.php
new file mode 100644
index 0000000..c38d198
--- /dev/null
+++ b/application/src/Entity/Attribut/SlugAttribut.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Entity\Attribut;
+
+trait SlugAttribut
+{
+    /**
+     * @var string
+     */
+    protected $slug;
+
+    public function setSlug(string $slug): void
+    {
+        $this->slug = $slug;
+    }
+
+    public function getSlug(): string
+    {
+        return $this->slug;
+    }
+}
diff --git a/application/src/Entity/Attribut/SlugAttributInterface.php b/application/src/Entity/Attribut/SlugAttributInterface.php
new file mode 100644
index 0000000..d106d87
--- /dev/null
+++ b/application/src/Entity/Attribut/SlugAttributInterface.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Entity\Attribut;
+
+interface SlugAttributInterface
+{
+    public function setSlug(string $slug): void;
+
+    public function getSlug(): string;
+}
diff --git a/application/src/Entity/Source/AbstractSource.php b/application/src/Entity/Source/AbstractSource.php
index 51458b7..448550f 100644
--- a/application/src/Entity/Source/AbstractSource.php
+++ b/application/src/Entity/Source/AbstractSource.php
@@ -15,6 +15,9 @@ use App\Entity\Meta\Law;
 use Doctrine\Common\Collections\ArrayCollection;
 use App\Entity\Attribut\MembershipsAttribut;
 use App\Entity\Source\Complex\Collection\TreeCollectionSourceInterface;
+use App\Entity\Attribut\SlugAttribut;
+use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
+use Symfony\Component\Validator\Constraints as Assert;
 
 /**
  * @author kevinfrantz
@@ -24,10 +27,22 @@ use App\Entity\Source\Complex\Collection\TreeCollectionSourceInterface;
  * @ORM\InheritanceType("JOINED")
  * @ORM\DiscriminatorColumn(name="discr", type="string")
  * @ORM\DiscriminatorMap({"primitive" = "App\Entity\Source\Primitive\AbstractPrimitiveSource", "collection" = "App\Entity\Source\Complex\Collection\AbstractCollectionSource","operation"="App\Entity\Source\Operation\AbstractOperation"})
+ * @UniqueEntity("slug",ignoreNull=true)
  */
 abstract class AbstractSource extends AbstractEntity implements SourceInterface
 {
-    use RelationAttribut,MembershipsAttribut, LawAttribut;
+    use RelationAttribut,MembershipsAttribut, LawAttribut,SlugAttribut;
+
+    /**
+     * System slugs should be writen in UPPER CASES
+     * Slugs which are defined by the user are checked via the assert.
+     *
+     * @ORM\Column(type="string",length=30,nullable=true,unique=true)
+     * @Assert\Regex(pattern="/^[a-z]+$/")
+     *
+     * @var string
+     */
+    protected $slug;
 
     /**
      * @var RelationInterface
diff --git a/application/src/Entity/Source/SourceInterface.php b/application/src/Entity/Source/SourceInterface.php
index 450c13f..f7702c5 100644
--- a/application/src/Entity/Source/SourceInterface.php
+++ b/application/src/Entity/Source/SourceInterface.php
@@ -7,10 +7,11 @@ use App\Entity\EntityInterface;
 use App\Entity\Attribut\LawAttributInterface;
 use App\Entity\Attribut\RelationAttributInterface;
 use App\Entity\Attribut\MembershipsAttributInterface;
+use App\Entity\Attribut\SlugAttributInterface;
 
 /**
  * @author kevinfrantz
  */
-interface SourceInterface extends IdAttributInterface, EntityInterface, MembershipsAttributInterface, LawAttributInterface, RelationAttributInterface
+interface SourceInterface extends IdAttributInterface, EntityInterface, MembershipsAttributInterface, LawAttributInterface, RelationAttributInterface, SlugAttributInterface
 {
 }
diff --git a/application/tests/Unit/Entity/Attribut/SlugAttributTest.php b/application/tests/Unit/Entity/Attribut/SlugAttributTest.php
new file mode 100644
index 0000000..072fbc1
--- /dev/null
+++ b/application/tests/Unit/Entity/Attribut/SlugAttributTest.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace Tests\Entity\Attribut;
+
+use PHPUnit\Framework\TestCase;
+use App\Entity\Attribut\SlugAttributInterface;
+use App\Entity\Attribut\SlugAttribut;
+
+/**
+ * @author kevinfrantz
+ */
+class SlugAttributTest extends TestCase
+{
+    /**
+     * @var SlugAttributInterface
+     */
+    protected $slugAttribut;
+
+    public function setUp(): void
+    {
+        $this->slugAttribut = new class() implements SlugAttributInterface {
+            use SlugAttribut;
+        };
+    }
+
+    public function testConstructor(): void
+    {
+        $this->expectException(\TypeError::class);
+        $this->slugAttribut->getSlug();
+    }
+
+    public function testAccessors(): void
+    {
+        $slug = 'goodslug';
+        $this->assertNull($this->slugAttribut->setSlug($slug));
+        $this->assertEquals($slug, $this->slugAttribut->getSlug());
+    }
+}
diff --git a/application/tests/Unit/Entity/Source/AbstractSourceTest.php b/application/tests/Unit/Entity/Source/AbstractSourceTest.php
index 24d2299..26dada2 100644
--- a/application/tests/Unit/Entity/Source/AbstractSourceTest.php
+++ b/application/tests/Unit/Entity/Source/AbstractSourceTest.php
@@ -33,4 +33,10 @@ class AbstractSourceTest extends TestCase
         $this->assertInstanceOf(Collection::class, $this->source->getMemberships());
         $this->assertInstanceOf(LawInterface::class, $this->source->getLaw());
     }
+
+    public function testSlugInit(): void
+    {
+        $this->expectException(\TypeError::class);
+        $this->source->getSlug();
+    }
 }