suggestion for allowing multiple contacts having the same role

Author: pvgenuchten

docs/content/reference/mcf.md

@@ -173,7 +173,7 @@ keywords_codelist|Optional|specific code list URL (for advanced use cases, else
 
 ### `contact`
 
-MCFs can have 1..n `contact` sections as required using nesting.  Example:
+MCFs can have 1..n `contact` sections as required using nesting. Role is used as key for any contact, if multiple contacts have the same role (e.g. `author`), you can add each of them by postfixing the role with an underscore and a unique string e.g. (`author_1`, `author_2`). Example:
 
 ```yaml
 contact:

pygeometa/schemas/iso19139/contact.j2

@@ -52,6 +52,6 @@
     </gmd:CI_Contact>
   </gmd:contactInfo>
   <gmd:role>
-    <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeSpace="ISOTC211/19115" codeListValue="{{ role }}">{{ role }}</gmd:CI_RoleCode>
+    <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeSpace="ISOTC211/19115" codeListValue="{{ role.split('_') | first }}">{{ role }}</gmd:CI_RoleCode>
   </gmd:role>
 </gmd:CI_ResponsibleParty>