Hints for crystal-facet-uml in main

crystal-facet-uml.desktop ⚙ amd64

asv-cid-desktopapp-is-not-rdns
crystal-facet-uml.metainfo.xml:3 - crystal-facet-uml.desktop
The component ID is not a reverse domain-name. Please update the ID to avoid future issues and be compatible with all AppStream implementations. You may also consider to update the name of the accompanying .desktop file to follow the latest version of the Desktop-Entry specification and use a rDNS name for it as well. In any case, do not forget to mention the new desktop-entry in a <launchable/> tag for this component to keep the application launchable from software centers and the .desktop file data associated with the metainfo data.
screenshot-download-error
Error while downloading screenshot from 'https://raw.githubusercontent.com/awarnke/crystal_facet_uml/master/user_doc/doc/screenshot_1.png': URL was not found on the server.
This might be a temporary server issue, or the screenshot is no longer available.

asv-url-not-secure
crystal-facet-uml.metainfo.xml:26 - http://andreaswarnke.de/crystal_facet_uml/html/index.html
Consider using a secure (HTTPS) URL for this web link.
asv-developer-name-tag-deprecated
crystal-facet-uml.metainfo.xml:35 -
The toplevel `developer_name` element is deprecated. Please use the `name` element in a `developer` block instead.
asv-content-rating-missing
crystal-facet-uml.metainfo.xml -
This component has no `content_rating` tag to provide age rating information. You can generate the tag data online by answering a few questions at https://hughsie.github.io/oars/
asv-developer-info-missing
crystal-facet-uml.metainfo.xml -
This component contains no `developer` element with information about its author.