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When importing fro ISO19139 xml and re-exporting to ISO19139.
I notice is change the

identification-info - citation - identifier - code.

I load infact an xml with this:

               <gmd:identifier>
                  <gmd:MD_Identifier>
                     <gmd:code>
                        <gco:CharacterString>RTSIGTA_UCS_PC_1</gco:CharacterString>
                     </gmd:code>
                  </gmd:MD_Identifier>
               </gmd:identifier>

and re-exporting I see it is became:

<gmd:identifier>
<gmd:RS_Identifier>
<gmd:code>
<gco:CharacterString>EN-2014-qIThrXZLnaRm_110708H59M16S</gco:CharacterString>
</gmd:code>
<gmd:codeSpace>
<gco:CharacterString>Unkwon</gco:CharacterString>
</gmd:codeSpace>
</gmd:RS_Identifier>
</gmd:identifier>

Please notice the usage of "RS_" instead of "MD_"

The RS_Identifier is an specialization of MD_Identifier.

But it is introduce for describe the ReferenceSystem (RS) not the Dataset.

SO I guess also if it is valid for XSD (as specialization of MD_) it is a wrng sage in semantic of metadata.

I attach an image fro ISO to try explain my dubt.

Regards,

A.