diff --git a/lib/galaxy/tool_util/xsd/galaxy.xsd b/lib/galaxy/tool_util/xsd/galaxy.xsd
index 092748cfa25d..c8f67bd61c2f 100644
--- a/lib/galaxy/tool_util/xsd/galaxy.xsd
+++ b/lib/galaxy/tool_util/xsd/galaxy.xsd
@@ -3731,6 +3731,7 @@ allow access to Python code to generate options for a select list. See
       <xs:element name="options" type="ParamOptions"/>
       <xs:element name="validator" type="Validator" />
       <xs:element name="sanitizer" type="Sanitizer"/>
+      <xs:element name="default" type="ParamDefault" />
       <xs:element name="help" type="xs:string">
         <xs:annotation>
           <xs:documentation xml:lang="en">Documentation for help</xs:documentation>
@@ -4115,6 +4116,41 @@ dataset for the contained input of the type specified using the ``type`` tag.
     </xs:attribute>
   </xs:complexType>
 
+  <xs:complexType name="ParamDefault">
+    <xs:annotation>
+      <xs:documentation xml:lang="en"><![CDATA[
+]]>
+</xs:documentation>
+    </xs:annotation>
+    <xs:sequence>
+      <xs:group ref="ParamDefaultCollectionElement" minOccurs="0" maxOccurs="unbounded"/>
+    </xs:sequence>
+    <xs:attribute name="collection_type" type="CollectionType" use="optional">
+      <xs:annotation>
+        <xs:documentation xml:lang="en"><![CDATA[
+Collection type for default collection (if param type is data_collection). Simple collection types are
+either ``list`` or ``paired``, nested collections are specified as colon separated list of simple
+collection types (the most common types are ``list``, ``paired``,
+``list:paired``, or ``list:list``).
+        ]]></xs:documentation>
+      </xs:annotation>
+    </xs:attribute>
+    <xs:attribute name="location" type="xs:string" use="optional">
+      <xs:annotation>
+        <xs:documentation xml:lang="en"><![CDATA[
+Galaxy-aware URI for the default file.
+        ]]></xs:documentation>
+      </xs:annotation>
+    </xs:attribute>
+
+  </xs:complexType>
+
+  <xs:group name="ParamDefaultCollectionElement">
+    <xs:choice>
+      <xs:element name="element" type="OutputData" />
+    </xs:choice>
+  </xs:group>
+
   <xs:complexType name="ParamOptions">
     <xs:annotation>
       <xs:documentation xml:lang="en"><![CDATA[