Add constraint link role

2 files changed, 25 insertions, 5 deletions

diff --git a/spec/spec/appl-config-option-constraints.yml b/spec/spec/appl-config-option-constraints.yml
index c93a1c7a..acbca0a5 100644
--- a/spec/spec/appl-config-option-constraints.yml
+++ b/spec/spec/appl-config-option-constraints.yml
@@ -14,10 +14,6 @@ spec-info:
         description: |
           This attribute defines a list of constraints.
         spec-type: list-str
-      links:
-        description: |
-          This attribute shall list links to constraints.
-        spec-type: list-uid
       max:
         description: |
           This attribute defines the maximum value.
@@ -32,7 +28,8 @@ spec-info:
         spec-type: list-int-or-str
     description: |
       This set of attributes defines application configuration option
-      constraints.
+      constraints.  Additional constraints can be added through the links of
+      the item using the :ref:`SpecTypeConstraintLinkRole`.
     required-attributes: none
 spec-name: Application Configuration Option Constraint Set
 spec-type: appl-config-option-constraints
diff --git a/spec/spec/constraint.yml b/spec/spec/constraint.yml
new file mode 100644
index 00000000..446c97f8
--- /dev/null
+++ b/spec/spec/constraint.yml
@@ -0,0 +1,23 @@
+SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
+copyrights:
+- Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
+enabled-by: true
+links:
+- role: spec-member
+  uid: root
+- role: spec-refinement
+  spec-key: role
+  spec-value: constraint
+  uid: link
+spec-description: null
+spec-example: null
+spec-info:
+  dict:
+    attributes: {}
+    description: |
+      It defines the constraint role of links.  The link target shall be a
+      constraint.
+    required-attributes: all
+spec-name: Constraint Link Role
+spec-type: constraint
+type: spec