Added dev / entity type

docs/.vuepress/sidebar.ts

@@ -21,6 +21,13 @@ export default [
             '/developer/overview',
             '/developer/coding-structure',
             '/developer/plugins',
+            {
+                text: 'Classes',
+                collapsible: true,
+                children: [
+                    '/developer/classes/entity_type',
+                ]
+            },
             '/developer/docs',
         ]
     }

docs/developer/classes/entity_type.md

@@ -0,0 +1,17 @@
+---
+
+---
+# Entity Type
+
+_Entity Types_ are the _Blueprints_ of created Entities. 
+They are a set of _Attributes_ in a specific order. 
+
+## Frontend Access
+
+_Entity Types_ can be created or modified inside the _Data Model Editor_. 
+
+## Relation
+
+_Entity Type_ Relations describe how entities can be structured inside 
+the entity tree. An _Entity_ of type **A** can only be a subentity of _Entity_ of type **B** if there is an _Entity Type Relation_ 
+that defines the _Entity Type Relation_ as `[parent: B, child: A]`.

docs/user/overview.md

@@ -1,20 +1,20 @@
 ---
 layout: GridLayout
-title: User
 grid:
   - icon: "./images/feature-icons/web-based.svg"
     title: Web-based Software
     details: The client can be accessed on any computer using a standard browser.
   - icon: "./images/feature-icons/custom.svg"
-    link: "./data-model.md"
+    link: "./data-model"
     title: Customizable Data Model
     details: Highly flexible project-specific data models with a wide range of attribute types.
   - icon: "./images/feature-icons/thesaurus.svg"
-    link: "./thesaurus.md"
+    link: "./thesaurus"
     title: Thesaurus
     details:  Multilingual and centrally controlled vocabulary for compliant with the SKOS standard.
   - icon: "./images/feature-icons/bib.svg"
     title: Bibliography
+    link: ./bibliography
     details: Basic bibliography management, allowing BibTex import and export.
   - icon: "./images/feature-icons/user.svg"
     title: User & Role Management