--- sml.xsd~	2015-03-01 13:22:06.797767084 -0500
+++ sml.xsd	2017-11-26 19:17:46.942081627 -0500
@@ -11,6 +11,17 @@
     schemaLocation="shared-commonSimpleTypes.xsd"/>
   <xsd:import namespace="http://schemas.openxmlformats.org/drawingml/2006/spreadsheetDrawing"
     schemaLocation="dml-spreadsheetDrawing.xsd"/>
+
+  <!-- MW: This import and this complexType added 20171126 -->
+  <xsd:import namespace="http://www.w3.org/XML/1998/namespace"
+           schemaLocation="http://www.w3.org/2001/xml.xsd"/>
+  <xsd:complexType name="CT_Text">
+    <xsd:simpleContent>
+      <xsd:extension base="s:ST_String">
+        <xsd:attribute ref="xml:space" use="optional"/>
+      </xsd:extension>
+    </xsd:simpleContent>
+  </xsd:complexType>
   <xsd:complexType name="CT_AutoFilter">
     <xsd:sequence>
       <xsd:element name="filterColumn" minOccurs="0" maxOccurs="unbounded" type="CT_FilterColumn"/>
@@ -1808,7 +1819,8 @@
   <xsd:complexType name="CT_RElt">
     <xsd:sequence>
       <xsd:element name="rPr" type="CT_RPrElt" minOccurs="0" maxOccurs="1"/>
-      <xsd:element name="t" type="s:ST_Xstring" minOccurs="1" maxOccurs="1"/>
+      <!-- MW: changed type from s:ST_String to CT_Text on 20171126 -->
+      <xsd:element name="t" type="CT_Text" minOccurs="1" maxOccurs="1"/>
     </xsd:sequence>
   </xsd:complexType>
   <xsd:complexType name="CT_RPrElt">
