From ea894480d45be5a976a14a1a61410a1669166d3f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Leandro=20Mel=C3=A3o=20Medeiros?=
 <leandro.medeiros.br@gmail.com>
Date: Mon, 29 Oct 2018 16:15:02 -0300
Subject: [PATCH] Update ReferenceBlock Class

Including the "class" attribute to the typeReferenceBlock definition allows you to update a block class when overriding or updating a layout.xml file without the need to remove the original block and re-add it with the same name but different class.
---
 lib/internal/Magento/Framework/View/Layout/etc/elements.xsd | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/internal/Magento/Framework/View/Layout/etc/elements.xsd b/lib/internal/Magento/Framework/View/Layout/etc/elements.xsd
index 39cdec05a65ea..6486b39070788 100755
--- a/lib/internal/Magento/Framework/View/Layout/etc/elements.xsd
+++ b/lib/internal/Magento/Framework/View/Layout/etc/elements.xsd
@@ -313,6 +313,7 @@
         </xs:choice>
         <xs:attribute type="elementNameType" name="name" use="required"/>
         <xs:attribute type="xs:string" name="template" use="optional"/>
+        <xs:attribute type="xs:string" name="class" use="optional"/>
         <xs:attribute type="xs:boolean" name="display" default="true" use="optional"/>
         <xs:attribute type="xs:boolean" name="remove" use="optional"/>
     </xs:complexType>