From 9cb705dedb71617abaf4604bf273b51b5ed56e91 Mon Sep 17 00:00:00 2001
From: "A.J. Stein" <aj@gsa.gov>
Date: Mon, 28 Oct 2024 21:40:55 -0400
Subject: [PATCH] Add a constraint for #221 to error on bad group-as

This new constraint implements a check for the following issue comment.

https://github.com/metaschema-framework/metaschema-java/issues/221#issuecomment-2442802840
---
 schema/metaschema/metaschema-module-constraints.xml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/schema/metaschema/metaschema-module-constraints.xml b/schema/metaschema/metaschema-module-constraints.xml
index 91346dc..d2d5b6c 100644
--- a/schema/metaschema/metaschema-module-constraints.xml
+++ b/schema/metaschema/metaschema-module-constraints.xml
@@ -46,6 +46,11 @@
                 <description>Ensure each import is a Metaschema module.</description>
                 <message>Unable the resource at '{{ resolve-uri(@href) }}' is not a Metaschema module.</message>
             </expect>
+            <expect id="module-model-group-as-in-json-invalid" target=".//(define-assembly|define-field|assembly|field)[@max-occurs=1]" test=".[not(group-as)]">
+                <formal-name>Group-As Behavior Used with Valid Max-Occurs</formal-name>
+                <description>Given group-as behavior for a parent assembly or field, you cannot have a group-as for multiple values.</description>
+                <message>The group-as for the parent location requires a max-occurs that is greater than 1 to support that feature.</message>
+            </expect>
         </constraints>
     </context>
     <context>