diff --git a/dap4/dap4.xsd b/dap4/dap4.xsd
index b79155d..f857766 100644
--- a/dap4/dap4.xsd
+++ b/dap4/dap4.xsd
@@ -192,6 +192,7 @@
         <xs:attribute name="name" type="xs:string" use="required"/>
         <xs:attribute name="type" type="AttributeType" use="required"/>
         <xs:attribute name="namespace" type="xs:string" use="optional"/>
+        <xs:attribute name="value" type="xs:string" use="optional"/>
     </xs:complexType>
 
     <xs:complexType name="ValueType" mixed="true">
diff --git a/tests/data/Attributes_test5.dmr b/tests/data/Attributes_test5.dmr
new file mode 100644
index 0000000..30d7c13
--- /dev/null
+++ b/tests/data/Attributes_test5.dmr
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Dataset xmlns="http://xml.opendap.org/ns/DAP/4.0#" dapVersion="4.0" dmrVersion="1.0" name="AtributesFile2.nc">
+    <Attribute name="_ChunkSizes" type="UInt32" value="5">
+        <Value>9674774</Value>
+    </Attribute>
+</Dataset>
\ No newline at end of file