From d94fcc3ae312421e4658c21bb8dfd4847a1a8b48 Mon Sep 17 00:00:00 2001
From: Daniil Baturin <daniil@vyos.io>
Date: Thu, 11 Jun 2020 23:46:33 +0300
Subject: T2588: add support for default values in the leaf node schema.

---
 schema/interface_definition.rnc | 10 +++++++---
 schema/interface_definition.rng | 20 +++++++++++++++++---
 2 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/schema/interface_definition.rnc b/schema/interface_definition.rnc
index 0ce8226cd..6647f5e11 100644
--- a/schema/interface_definition.rnc
+++ b/schema/interface_definition.rnc
@@ -57,14 +57,18 @@ tagNode = element tagNode
 # but can have values.
 # Leaf node may contain one or more valueConstraint tags
 # If multiple valueConstraint tags are used, they work a logical OR
-# Leaf nodes can have "multi" attribute that indicated that it can have
-# more than one value
+# Leaf nodes can have "multi" attribute that indicated that it can have more than one value
+# It can also have a default value
 leafNode = element leafNode
 {
     (ownerAttr? & nodeNameAttr),
-    properties
+    (defaultValue? & properties)
 }
 
+# Default value for leaf node, if applicable
+# It is used to generate default node state representation
+defaultValue = element defaultValue { text }
+
 # Normal and tag nodes may have children
 children = element children
 {
diff --git a/schema/interface_definition.rng b/schema/interface_definition.rng
index bfd8d376f..22e886006 100644
--- a/schema/interface_definition.rng
+++ b/schema/interface_definition.rng
@@ -95,8 +95,8 @@
     but can have values.
     Leaf node may contain one or more valueConstraint tags
     If multiple valueConstraint tags are used, they work a logical OR
-    Leaf nodes can have "multi" attribute that indicated that it can have
-    more than one value
+    Leaf nodes can have "multi" attribute that indicated that it can have more than one value
+    It can also have a default value
   -->
   <define name="leafNode">
     <element name="leafNode">
@@ -106,7 +106,21 @@
         </optional>
         <ref name="nodeNameAttr"/>
       </interleave>
-      <ref name="properties"/>
+      <interleave>
+        <optional>
+          <ref name="defaultValue"/>
+        </optional>
+        <ref name="properties"/>
+      </interleave>
+    </element>
+  </define>
+  <!--
+    Default value for leaf node, if applicable
+    It is used to generate default node state representation
+  -->
+  <define name="defaultValue">
+    <element name="defaultValue">
+      <text/>
     </element>
   </define>
   <!-- Normal and tag nodes may have children -->
-- 
cgit v1.2.3