The Slovenian interoperability NIO Portal is a national web portal for publishing and harvesting interoperability solutions of the public sector. Besides the publishing, the portal provides the main resources for keeping track of and use various interoperability (technical, semantical, organizational, legal) solutions. NIO has been upgraded visually and technically several times. The upgrade has introduced new features enabling enhanced experience and usability of the portal in order to publish and export the interoperability solutions using standard vocabularies (ADMS and DCAT). NIO portal supports two different views: end-user’s and editor’s view. End-user’s view enables non-registered end-users to review and access interoperability solutions. Editor’s view provides registered editors to publish new interoperability content (data, applications). Most important part of the editor’s view is a workflow for publishing and review process of published interoperability solutions in order to add these to the catalog.