mdrpi is an undeclared prefix

[Peter Schober]

* Lohr, Donald <lohrda at jmu.edu> [2019-04-25 17:01]:
> “Error importing metadata from <path to xml file>: ‘mdrpi’ is an undeclared
> prefix. Line 3, position 6.
[...]
> <mdrpi:RegistrationInfo registrationAuthority="https://incommon.org"/>

That's because you did not define that prefix, as the error said.

> I found online one that looks like this:
> 
> <mdrpi:RegistrationInfo xmlns:mdrpi="urn:oasis:names:tc:SAML:metadata:rpi"
> registrationAuthority="https://incommon.org 

Note the XML NameSpace declaration (xmlns:someprefix) there.

For my own locally managed metadata I simply declare all commonly used
XML namespaces in the root EntitiesDescriptor XML element so I don't
have to declare any within individual EntityDescriptors or child
elements thereof, e.g.:

<EntitiesDescriptor
  xmlns="urn:oasis:names:tc:SAML:2.0:metadata"
  xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata"
  xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
  xmlns:shibmd="urn:mace:shibboleth:metadata:1.0"
  xmlns:disco="urn:oasis:names:tc:SAML:profiles:SSO:idp-discovery-protocol"
  xmlns:idpdisc="urn:oasis:names:tc:SAML:profiles:SSO:idp-discovery-protocol"
  xmlns:init="urn:oasis:names:tc:SAML:profiles:SSO:request-init"
  xmlns:mdui="urn:oasis:names:tc:SAML:metadata:ui"
  xmlns:mdrpi="urn:oasis:names:tc:SAML:metadata:rpi"
  xmlns:mdattr="urn:oasis:names:tc:SAML:metadata:attribute"
  xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
  xmlns:xenc="http://www.w3.org/2001/04/xmlenc#"
  xmlns:alg="urn:oasis:names:tc:SAML:metadata:algsupport"
  xmlns:req-attr="urn:oasis:names:tc:SAML:protocol:ext:req-attr"
  xmlns:refeds="http://refeds.org/metadata"
  Name="http://your.example.org/local-entities">

  <!-- your EntityDescriptor elements here -->

</EntitiesDescriptor>

-peter