docs: Add working copy of the data model for elaborating the next mod…

…el version (DEV-4307) (#275)

.markdownlint.yml

@@ -1,7 +1,7 @@
 # Config file for https://github.com/igorshubovych/markdownlint-cli
 
 # MD007/ul-indent - Unordered list indentation
-MD007: 
+MD007:
     # Whether to indent the first level of the list
     start_indented: false
     # By how many spaces every next level must be indented. The default of 2 is not compatible with mkdocs!
@@ -14,7 +14,7 @@ MD009: false
 MD012: false
 
 # MD013/line-length - Line length
-MD013: 
+MD013:
     line_length: 120
     heading_line_length: 120
     code_block_line_length: 120
@@ -30,8 +30,11 @@ MD013:
     # Stern length checking
     stern: false
 
+MD024:
+    siblings_only: true
+
 # MD033/no-inline-html - Inline HTML
-MD033: 
+MD033:
     allowed_elements: [br, center]
 
 # MD041/first-line-heading/first-line-h1 - First line in a file should be a top-level heading

docs/data/datamodel.md → docs/data/current-datamodel.md

@@ -1,4 +1,4 @@
-# Data Model
+# Current Data Model
 
 All metadata are modelled according to the model as described in the following.