- fix some discrepancies with the xsd

ome-metadata-derive/src/lib.rs

@@ -10,11 +10,11 @@ pub fn ome_metadata_derive_xml(input: TokenStream) -> TokenStream {
     let expanded = quote! {
         impl #ident {
             pub fn from_xml<T: AsRef<str>>(s: T) -> Result<Self, Error> {
-                Ok(from_str(s.as_ref())?)
+                from_str(s.as_ref())
             }
 
             pub fn to_xml(&self) -> Result<String, Error> {
-                Ok(to_string(self)?)
+                to_string(self)
             }
         }
     };