diff --git a/schema/lib/types/cksum.xsd b/schema/lib/types/cksum.xsd
index 41e3d97..128dd76 100644
--- a/schema/lib/types/cksum.xsd
+++ b/schema/lib/types/cksum.xsd
@@ -5,6 +5,7 @@
 
     <xs:include schemaLocation="./std.xsd"/>
     <xs:include schemaLocation="./net.xsd"/>
+    <xs:include schemaLocation="./unix.xsd"/>
 
     <xs:simpleType name="t_cksum_algo">
         <!-- Geared towards python. -->
@@ -42,10 +43,20 @@
         <xs:simpleContent>
             <xs:extension base="t_net_generic_resource">
                 <xs:attribute name="hashType" use="required" type="t_cksum_algo"/>
+                <xs:attribute name="fileType" use="required" type="t_cksum_file_filetype"/>
+                <xs:attribute name="filePath" use="optional" type="t_unix_filepath"/>
             </xs:extension>
         </xs:simpleContent>
     </xs:complexType>
 
+    <xs:simpleType name="t_cksum_file_filetype">
+        <xs:restriction base="xs:string">
+            <xs:enumeration value="gnu"/>
+            <xs:enumeration value="bsd"/>
+            <xs:whiteSpace value="collapse"/>
+        </xs:restriction>
+    </xs:simpleType>
+
     <xs:complexType name="t_cksum_hash">
         <xs:simpleContent>
             <xs:extension base="t_std_nonempty">
diff --git a/schema/lib/types/unix.xsd b/schema/lib/types/unix.xsd
index c65bb27..c1d8896 100644
--- a/schema/lib/types/unix.xsd
+++ b/schema/lib/types/unix.xsd
@@ -43,6 +43,14 @@
         </xs:restriction>
     </xs:simpleType>
 
+    <!-- https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_282 -->
+    <xs:simpleType name="t_unix_portablePosixFilename">
+        <xs:restriction base="xs:string">
+            <xs:pattern value="[A-Za-z0-9._-]+"/>
+            <xs:whiteSpace value="collapse"/>
+        </xs:restriction>
+    </xs:simpleType>
+    
     <xs:simpleType name="t_unix_posixUserGroup">
         <!-- https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_437
              https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_282