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+@prefix adms: <http://www.w3.org/ns/adms#> .
+@prefix dc: <http://purl.org/dc/terms/> .
+@prefix dcat: <http://www.w3.org/ns/dcat#> .
+@prefix doap: <http://usefulinc.com/ns/doap#> .
+@prefix doap-deps: <http://ontologi.es/doap-deps#> .
+@prefix foaf: <http://xmlns.com/foaf/0.1/> .
+@prefix owl: <http://www.w3.org/2002/07/owl#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
+@prefix spdx: <http://spdx.org/rdf/terms#> .
+
+#This document uses turtle-flavored markdown comments:
+#Lines beginning with "# " is markdown, modulo those characters.
+#Markdown "[QName]" considers homepage-ish nodes of QName for linking.
+#Markdown "[:QName]" expands to RDF nodes of QName as human sentences.
+#Markdown "[SELECT {...}]" expands to SPARQL result as human paragraphs.
+#Markdown "[{...}]" expands to "[SELECT * WHERE {...}]", human sorted.
+
+# # WebRTC
+# WebRTC is the contemporary open standard for realtime media streaming.
+#
+# This document identifies WebRTC parts and integrations
+# and their qualities related to usability and sustainability.
+#
+# ## Usability
+#
+# WebRTC consists of multiple parts,
+# each crucial for a good user experience.
+#
+# A good user experience should not only be here and now,
+# but also into the future and for everyone.
+# Qualities related to sustainability include
+# collaboration (Free software and open standards),
+# resilience and maintainability (e.g. software distribution integration),
+# and footprint (e.g. electricity, memory, and computation consumption).
+
+:component
+	a skos:Concept;
+	skos:prefLabel "WebRTC Component";
+	dc:description """
+Tool or service doing a specific task,
+e.g. transcoding RTP streaming between WebRTC-compatible and other formats.
+""".
+
+:framework
+	a skos:Concept;
+	skos:prefLabel "WebRTC Framework";
+	dc:description """
+Set of tools and/or integrations with external components,
+for providing a coherent developer interface for building platforms and/or services.
+""".
+
+:platform
+	a skos:Concept;
+	skos:prefLabel "WebRTC Platform";
+	dc:description """
+Set of tools and/or integrations with external components,
+for providing a coherent user-facing application as a service.
+""".
+
+:service
+	a skos:Concept;
+	skos:prefLabel "WebRTC Service";
+	dc:description """
+Coherent user-facing application provided as a service.
+""".
+
+# ### Services
+#
+# [:service]
+#
+# [{ ?project doap:category :service }]
+
+# ### Platforms
+#
+#TODO: generate short "see above" entries instead
+# [:platform]
+# See also above for platforms also provided as a service.
+#
+# [{ ?project doap:category :mixing MINUS { ?project doap:category :routing } }]
+
+:janus
+	a dcat:Dataset,
+		doap:Project;
+	doap:name "Janus";
+	doap:shortdesc "general purpose WebRTC server/gateway";
+	doap:category :framework;
+	doap:homepage <https://janus.conf.meetecho.com/>;
+	doap:download-page <https://github.com/meetecho/janus-gateway>;
+	doap:license :gpl_3;
+	doap:programming-language "C", "JavaScript";
+	doap:implements :sfu.
+
+:mediasoup
+	a dcat:Dataset,
+		doap:Project;
+	doap:name "Mediasoup";
+	doap:shortdesc "WebRTC selective forwarding unit (SFU)";
+	doap:category :framework;
+	doap:homepage <https://mediasoup.org/>;
+	doap:download-page <https://github.com/versatica/mediasoup>;
+	rdfs:seeAlso <https://github.com/versatica/mediasoup/wiki/Congestion-Control>;
+	doap:license :isc;
+	doap:programming-language "C++", "TypeScript";
+	doap:implements :cc-remb, :sfu.
+
+:medooze
+	a dcat:Dataset,
+		doap:Project;
+	doap:name "Medooze SFU";
+	doap:shortdesc "WebRTC selective forwarding unit (SFU)";
+	doap:category :framework;
+	doap:homepage <http://www.medooze.com/>;
+	doap:download-page <https://github.com/medooze/media-server-node>;
+	doap:license :expat;
+	doap:programming-language "C++", "JavaScript";
+	doap:implements :sfu, :mcu.
+
+:spreed
+	a dcat:Dataset,
+		doap:Project;
+	doap:name "Spreed WebRTC";
+	doap:shortdesc "WebRTC audio/video call and conferencing server";
+	doap:category :routing;
+	doap:download-page <https://github.com/strukturag/spreed-webrtc>;
+	doap:license :agpl_3;
+	doap:programming-language "Go", "JavaScript";
+	doap:implements :sfu.
+
+:jitsi-videobridge
+	a dcat:Dataset,
+		doap:Project;
+	doap:name "Jitsi Videobridge";
+	doap:shortdesc "WebRTC compatible video router or SFU";
+	dc:comment "Seems biased towards XMPP-based signalling.",
+		"Seems biased towards [plan B][legacy-planb].";
+	doap:category :routing;
+	doap:homepage <https://jitsi.org/jitsi-videobridge/>;
+	doap:download-page <https://github.com/jitsi/jitsi-videobridge>;
+	rdfs:seeAlso <https://github.com/jitsi/jitsi-videobridge/blob/master/doc/sfu.md>,
+		<https://github.com/jitsi/jitsi-meet/issues/4758>;
+	doap:license :apache_2;
+	doap:programming-language "Java", "JavaScript";
+	doap:implements :cc-gcc, :sfu, :xmpp-colibri.
+
+:kurento-kms
+	a dcat:Dataset,
+		doap:Project;
+	doap:name "Kurento Media Server";
+	doap:shortdesc "WebRTC Media Server";
+	doap:category :framework;
+	doap:homepage <https://www.kurento.org/>;
+	doap:download-page <https://github.com/Kurento/kurento-media-server>;
+	rdfs:seeAlso <https://doc-kurento.readthedocs.io/en/6.13.0/user/about.html#kurento-media-server>;
+	doap:license :apache_2;
+	doap:programming-language "C++";
+	doap:implements :mcu, :sfu.
+
+:licode
+	a dcat:Dataset,
+		doap:Project;
+	doap:name "Licode";
+	doap:shortdesc "WebRTC Communications Platform";
+	doap:category :framework;
+	doap:homepage <https://lynckia.com/licode/>;
+	doap:download-page <https://github.com/lynckia/licode>;
+	doap:license :expat;
+	doap:programming-language "C++", "JavaScript";
+	doap:implements :mcu, :sfu.
+
+:openvidu
+	a dcat:Dataset,
+		doap:Project;
+	doap:name "OpenVidu";
+	doap:shortdesc "platform to facilitate the addition of video calls in your web or mobile application";
+	doap:category :platform;
+	doap:homepage <https://openvidu.io/>;
+	doap:download-page <https://github.com/OpenVidu/openvidu>;
+	doap:license :apache_2;
+	adms:includedAsset :kurento-kms;
+	doap:programming-language "Java", "TypeScript";
+	doap:implements :sfu.
+
+:red5
+	a dcat:Dataset,
+		doap:Project;
+	doap:name "Ant Media Server";
+	doap:shortdesc "WebRTC SFU";
+	doap:category :component;
+	doap:homepage <https://www.red5pro.com/>;
+	doap:download-page <https://github.com/Red5/red5-server>;
+	doap:license :apache_2;
+	doap:programming-language "Java";
+	doap:implements :sfu.
+
+:ant
+	a dcat:Dataset,
+		doap:Project;
+	doap:name "Red5 Server";
+	doap:shortdesc "WebRTC SFU";
+	dc:comment "Fork of [Red5 Server][red5].";
+	doap:category :component;
+	doap:homepage <https://antmedia.io/>;
+	doap:download-page <https://github.com/ant-media/Ant-Media-Server>;
+	doap:license :apache_2;
+	doap:programming-language "Java";
+	doap:implements :sfu.
+
+:medooze
+	a dcat:Dataset,
+		doap:Project;
+	doap:name "Medooze media-server";
+	doap:shortdesc "WebRTC media server";
+	doap:category :mixing;
+	doap:homepage <http://www.medooze.com/products/mcu.aspx>;
+	doap:download-page <https://github.com/medooze/media-server>;
+	doap:license :gpl_2;
+	doap:programming-language "C++", "JavaScript";
+	doap:implements :cc-transport, :priv-perc, :mcu.
+
+# ### Bridging
+#
+# [:bridging]
+# Tools also doing WebRTC streaming are excluded here
+# (see above listings).
+#
+# [{ ?project doap:category :mixing MINUS { ?project doap:category :routing . ?project doap:category :mixing } }]
+
+:sylk-server
+	a dcat:Dataset,
+		doap:Project;
+	doap:name "SylkServer";
+	doap:shortdesc "SIP/XMPP Application Server";
+	dc:comment "Code is Python 2.x, a language dialect obsoleted upstream.";
+	doap:category :platform;
+	doap:homepage <https://sylkserver.com/>;
+	doap:download-page <https://github.com/AGProjects/sylkserver>;
+	doap:license :gpl_3;
+	adms:includedAsset :janus;
+	doap:programming-language "Python";
+	doap:implements :sip, :xmpp, :sfu.
+
+:jitsi-jigasi
+	a dcat:Dataset,
+		doap:Project;
+	doap:name "Jigasi";
+	doap:shortdesc "WebRTC bridge to Jitsi Videobridge";
+	doap:category :component;
+	doap:download-page <https://github.com/jitsi/jigasi>;
+	doap:license :apache_2;
+	doap:programming-language "Java";
+#	doap:implements :webrtc-transcoder.
+
+:matrix-synapse
+	a dcat:Dataset,
+		doap:Project;
+	doap:name "Matrix-Synapse";
+	doap:shortdesc "Federated text chat with WebRTC direct chat and optional WebRTC conferencing";
+	doap:category :platform;
+	doap:download-page <https://github.com/matrix-org/synapse>;
+	doap:license :apache_2;
+	doap:programming-language "Python";
+	doap:implements :matrix, :webrtc-p2p.
+
+:bigbluebutton
+	a dcat:Dataset,
+		doap:Project;
+	doap:name "BigBlueButton";
+	doap:shortdesc "web conferencing system for online learning";
+	dc:comment "Uses Kurento Media Server only for one-way streaming, and locally implemented SFU.";
+	doap:category :platform;
+	doap:homepage <https://bigbluebutton.org/>;
+	doap:download-page <https://github.com/bigbluebutton/bigbluebutton>;
+	rdfs:seeAlso <https://docs.bigbluebutton.org/2.2/architecture.html#kurento-and-webrtc-sfu>,
+		<https://github.com/bigbluebutton/bbb-webrtc-sfu>;
+	doap:license :lgpl_3;
+	adms:includedAsset :kurento-kms;
+	doap:programming-language "Java";
+	doap:implements :sfu.
+
+:openmeetings
+	a dcat:Dataset,
+		doap:Project;
+	doap:name "OpenMeetings";
+	doap:shortdesc "Collaboration Platform";
+	dc:comment """
+Uses Kurento Media Server and Red5 only for one-way streaming, and locally implemented SFU.
+SFU was first introduced with release 5.0.0-M3 on 2019-12-16.
+""";
+	doap:category :platform;
+	doap:homepage <https://openmeetings.apache.org/>;
+	doap:download-page <https://github.com/apache/openmeetings>;
+	rdfs:seeAlso <https://docs.bigbluebutton.org/2.2/architecture.html#kurento-and-webrtc-sfu>,
+		<https://github.com/bigbluebutton/bbb-webrtc-sfu>;
+	doap:license :apache_2;
+	adms:includedAsset :kurento-kms, :red5;
+	doap:programming-language "Java", "JavaScript";
+	doap:implements :sfu.
+
+Wire Audio Video Signaling -
+[Wire](https://wire.com/) Application Server
+using for [MLS](https://messaginglayersecurity.rocks/),
+and using internal FIXME for WebRTC SFU,
+written in Haskell, Rust, C,
+FIXME.
+
+### Web frontend
+
+[mediasoup-demo](https://github.com/versatica/mediasoup-demo)
+using Mediasoup
+written in JavaScript
+hosted at <https://v3demo.mediasoup.org/>
+
+[multiparty-meeting](https://edumeet.org/)
+at [Github](https://github.com/havfo/multiparty-meeting)
+using Mediasoup
+(and optionally drachtio and Kurento Media Server),
+written in JavaScript
+hosted at <https://edumeet.geant.org/> and <https://letsmeet.no/>
+
+[Jangouts](https://github.com/jangouts/jangouts)
+using Janus,
+written in CoffeeScript
+
+[Roomler](https://github.com/gjovanov/roomler)
+using Janus,
+written in VueJS
+hosted at <https://roomler.live/>
+
+[tawk.space](https://github.com/invisible-college/tawk.space)
+using Janus
+written in CoffeeScript
+hosted at <https://tawk.space/>
+
+[SIP2SIP](https://ag-projects.com/sip2sip/)
+using SylkServer and Janus
+hosted at <https://sip2sip.info/>
+and <https://webrtc.sipthor.net/>
+
+[Roll Call](https://github.com/mikeal/roll-call)
+audio-only
+hosted at <https://roll.call>
+
+[Spreed.ME](https://www.spreed.me/)
+using Spreed WebRTC
+
+[Nextcloud Talk](https://nextcloud.com/talk/)
+using Spreed WebRTC
+
+[Jitsi Meet](https://jitsi.org/jitsi-meet/)
+using Jigasi and Jitsi Videobridge
+hosted at <https://meet.jit.si/>
+
+[mConf](http://mconf.org/)
+using Kurento Media Server
+written in Java and Ruby
+
+[Veeting](https://veeting.com/)
+cloud SFU service
+using Janus
+hosted at <https://rooms.veeting.com/>
+(free trial at <https://rooms.veeting.com/home-office>)
+
+[Talky](https://about.talky.io/)
+cloud SFU service
+hosted at <https://talky.io/>
+
+[Me](https://join.me/)
+cloud SFU service
+
+GoToMeeting
+cloud SFU service
+
+[Zoom Meetings](https://zoom.us/)
+cloud SFU service
+supporting "up to 50 participants at once"
+(but client bandwidth and resource demands and stability of such session is unknown)
+
+Hangouts Meet
+cloud SFU service
+
+Webex Meetings
+cloud SFU service
+
+Wowza Streaming Cloud
+cloud streaming service
+
+Skype
+cloud SFU service
+suporting "up to 25 participants at once"
+(but client bandwidth and resource demands and stability of such session is unknown)
+
+MoxieMeet
+cloud SFU service
+requiring Google account
+supporting "up to 32 users all on video together"
+(but client bandwidth and resource demands and stability of such session is unknown)
+
+TeamViewer
+cloud SFU service
+
+
+# ## specs
+
+# ### Topology
+
+:sfu
+	a doap:Specification;
+	skos:prefLabel "Selective Forwarding Unit";
+	skos:altLabel "SFU";
+	rdfs:seeAlso <https://webrtcglossary.com/sfu/>.
+
+:mcu
+	a doap:Specification;
+	skos:prefLabel "Multipoint Conferencing Unit";
+	skos:altLabel "MCU";
+	rdfs:seeAlso <https://webrtcglossary.com/mcu/>.
+
+# ### Integration
+
+:xmpp-colibri
+	a doap:Specification;
+	skos:prefLabel "XMPP COLIBRI";
+	foaf:homepage <https://xmpp.org/extensions/xep-0340.html>.
+
+# ### Congestion Control
+
+:cc
+	a skos:Concept;
+	skos:prefLabel "Congestion Control";
+	rdfs:seeAlso <https://webrtcglossary.com/bwe/>,
+		<https://blog.mozilla.org/webrtc/what-is-rmcat-congestion-control/>,
+		<https://pantheon.stanford.edu/>,
+		<https://github.com/versatica/mediasoup/wiki/Congestion-Control>,
+		<https://wiki.asterisk.org/wiki/display/AST/WebRTC+User+Experience+Improvements#WebRTCUserExperienceImprovements-BandwidthEstimationandControl(RTCPFeedback)>.
+
+:cc-transport
+	a doap:Specification;
+	skos:prefLabel "RTP Transport-wide Congestion Control";
+	skos:altLabel "Google Transport-wide Congestion Control",
+		"transport-cc",
+		"TWCC";
+	dc:comment """
+	Supported for bundled streams in Gecḱo-based web browsers since mozilla/76.
+""";
+	rdfs:seeAlso <https://bugzilla.mozilla.org/show_bug.cgi?id=1606823>,
+		<https://bugzilla.mozilla.org/show_bug.cgi?id=1626383>;
+	foaf:homepage <https://www.ietf.org/archive/id/draft-holmer-rmcat-transport-wide-cc-extensions-01.txt>.
+
+# #### Sender side bitrate estimation
+
+:cc-gcc
+	a doap:Specification;
+	skos:prefLabel "Google Congestion Control";
+	skos:altLabel "GCC";
+	foaf:homepage <https://www.ietf.org/archive/id/draft-ietf-rmcat-gcc-02.txt>.
+
+:cc-nada
+	a doap:Specification;
+	skos:prefLabel "Network-Assisted Dynamic Adaptation";
+	skos:altLabel "NADA";
+	sioc:previous_version <https://datatracker.ietf.org/doc/draft-ietf-rmcat-nada/>;
+	foaf:homepage <https://datatracker.ietf.org/doc/rfc8698/>;
+	owl:sameAs <urn:ietf:rfc:8698>.
+
+:cc-scream
+	a doap:Specification;
+	skos:prefLabel "Self-Clocked Rate Adaptation for Multimedia";
+	skos:altLabel "SCReAM";
+	rdfs:seeAlso <https://github.com/EricssonResearch/scream>;
+	sioc:previous_version <https://datatracker.ietf.org/doc/draft-ietf-rmcat-scream-cc/>;
+	foaf:homepage <https://datatracker.ietf.org/doc/rfc8298/>;
+	owl:sameAs <urn:ietf:rfc:8298>.
+
+:cc-tmmbr
+	a doap:Specification;
+	skos:prefLabel "Temporary Maximum Media Stream Bit Rate Request";
+	skos:altLabel "TMMBR";
+	rdfs:seeAlso <https://bugs.chromium.org/p/webrtc/issues/detail?id=7103>,
+		<https://bugzilla.mozilla.org/show_bug.cgi?id=1270230>;
+	foaf:page <https://tools.ietf.org/html/draft-ietf-rtcweb-rtp-usage-26#section-5.1.6>.
+
+# #### Receiver side bitrate estimation
+
+:cc-remb
+	a doap:Specification;
+	skos:prefLabel "Receiver Estimated Maximum Bitrate";
+	skos:altLabel "REMB";
+	skos:altLabel "goog-remb";
+	rdfs:comment: """
+Seemingly abandoned in libwebrtc
+and dropped since Firefox 96.
+"""
+	rdfs:seeAlso <https://webrtcglossary.com/remb/>,
+		<https://bugzilla.mozilla.org/show_bug.cgi?id=1654112#c358>;
+	foaf:homepage <https://www.ietf.org/archive/id/draft-alvestrand-rmcat-remb-03.txt>.
+
+# ### Codec
+
+:codec
+	a skos:Concept;
+	skos:prefLabel "Codec".
+
+:codec-vp8
+	a doap:Specification;
+	skos:prefLabel "VP8";
+	dc:abstract "VP8 is a roualty-free video codec, mandatory part of the WebRTC specification.";
+	rdfs:comment: """
+Performance is notoriously weak on operating system iOS,
+likely related to Apple investments
+in the directly competing royalty-based codec H.264.
+"""
+	rdfs:seeAlso <https://webrtcglossary.com/vp8/>,
+		<https://caniuse.com/#feat=webm>,
+		<https://webkit.org/blog/8672/on-the-road-to-webrtc-1-0-including-vp8/>.
+
+# ### Compatibility
+
+:legacy
+	a skos:Concept;
+	skos:prefLabel "Legacy".
+
+:legacy-blink
+	a doap:Specification;
+	skos:prefLabel "Legacy Blink";
+	dc:abstract "Adequate quirks to work around WebRTC violations in Blink"
+	dc:comment """
+The web browser engine Blink
+(used e.g. in Google Chrome and Chromium)
+introduced WebRTC before it was formally defined,
+and the later definition changed at several places
+where the Blink codebase didn't adjust even after 5-10 years.
+Some tools not explicitly tracking Blink issues
+might implicitly have hardcoded non-standard Blink protocols
+and fail subtly for other clients implementing \"by the book\".
+"""
+	rdfs:seeAlso <https://bugs.chromium.org/p/webrtc/issues/list>.
+
+:legacy-gecko
+	a doap:Specification;
+	skos:prefLabel "Legacy Gecko";
+	dc:abstract "Adequate quirks to work around WebRTC violations in Gecko"
+	rdfs:seeAlso <https://bugzilla.mozilla.org/buglist.cgi?component=WebRTC&bug_status=__open__>,
+		<https://bugzilla.mozilla.org/buglist.cgi?component=WebRTC%3A%20Audio%2FVideo&bug_status=__open__>,
+		<https://bugzilla.mozilla.org/buglist.cgi?component=WebRTC%3A%20Networking&bug_status=__open__>,
+		<https://bugzilla.mozilla.org/buglist.cgi?component=WebRTC%3A%20Signaling&bug_status=__open__>,
+		<https://bugzilla.mozilla.org/buglist.cgi?status_whiteboard_type=substring&status_whiteboard=jitsi-meet>.
+
+:legacy-webkit
+	a doap:Specification;
+	skos:prefLabel "Legacy WebKit";
+	dc:abstract "Adequate quirks to work around WebRTC violations in WebKit"
+	dc:comment """
+The web browser engine WebKit
+(used e.g. in Apple Safari and GNOME Web)
+has a notoriously buggy WebRTC implementation,
+needing several workarounds
+for anything but simple things
+like one-way streaming or 1-to-1 meetings.
+Only tools paying special attention to WebKit or Safari or iOS
+are likely to provide a decent experience in WebKit-based environments.
+"""
+	rdfs:seeAlso <https://webrtchacks.com/guide-to-safari-webrtc/>;
+		<https://bugs.webkit.org/buglist.cgi?component=WebRTC&resolution=--->.
+
+# ### Privacy
+
+:priv
+	a skos:Concept;
+	skos:prefLabel "Privacy".
+	rdfs:seeAlso <https://w3c.github.io/webrtc-nv-use-cases/#no-trust-webex>,
+		<https://github.com/matrix-org/matrix-doc/labels/e2e>.
+
+:priv-mdns
+	a doap:Specification;
+	skos:prefLabel "Using Multicast DNS to protect privacy when exposing ICE candidates";
+	rdfs:seeAlso <https://datatracker.ietf.org/doc/draft-ietf-rtcweb-mdns-ice-candidates/>.
+
+:priv-mls
+	a doap:Specification;
+	skos:prefLabel "Messaging Layer Security (MLS)";
+	rdfs:seeAlso <https://github.com/matrix-org/matrix-doc/issues/1871>,
+		<https://github.com/matrix-org/matrix-doc/issues/2353>,
+		<https://github.com/matrix-org/matrix-doc/issues/2458>.
+	sioc:previous_version <https://datatracker.ietf.org/doc/draft-barnes-mls-protocol/>,
+		<https://datatracker.ietf.org/doc/draft-omara-mls-architecture/>;
+	foaf:page <https://datatracker.ietf.org/doc/draft-ietf-mls-architecture/>,
+		<https://datatracker.ietf.org/doc/draft-ietf-mls-protocol/>,
+		<https://www.ietf.org/archive/id/draft-ietf-mls-federation-00.txt>.
+
+:priv-perc
+	a doap:Specification;
+	skos:prefLabel "Privacy Enhanced RTP Conferencing (PERC)";
+	rdfs:seeAlso
+		<https://webrtcglossary.com/perc/>,
+		<https://webrtchacks.com/true-end-to-end-encryption-with-webrtc-insertable-streams/>,
+		<https://jitsi.org/blog/e2ee/>
+		<https://github.com/meetecho/janus-gateway/pull/933>,
+		<https://github.com/matrix-org/matrix-doc/pull/2359>.
+
+# ### Redundancy
+
+:resilience
+	a skos:Concept;
+	skos:prefLabel "Resilience";
+	rdfs:seeAlso <https://webrtcglossary.com/tag/error-resiliency/>.
+
+:red
+	a doap:Specification;
+	skos:prefLabel "Redundant Audio Data (RED)";
+	rdfs:seeAlso <https://bugzilla.mozilla.org/show_bug.cgi?id=875922>;
+	sioc:previous_version <https://datatracker.ietf.org/doc/draft-ietf-avt-rtp-redundancy/>;
+	foaf:homepage <https://datatracker.ietf.org/doc/rfc2198/>;
+	owl:sameAs <urn:ietf:rfc:2198>.
+
+:rtp-rtx
+	a doap:Specification;
+	skos:prefLabel "RTP Retransmission Payload Format (RTX)";
+	dc:description """
+RTP packet retransmission allows a client
+to request retransmission of an RTP packet
+if they determine that it has been lost.
+It is up to their own logic to determine
+when they request this to be done.
+The request is done using a NACK RTCP feedback message.
+If the packet is in the history of the sender it is then resent.
+In the case of Chrome it is sent using RFC4588 (if negotiated)
+which encapsulates the retransmitted packet
+and sends it on a separate stream.
+In the case of Firefox (before release 76) the packet is resent as-is.
+""";
+	dc:comment """
+Description based on Asterisk note.
+Seems interoperability issues involving lack of RTX support may hide additional flaws at the other side:
+Allegedly packets sent as-is (not tagged as per RFC4588) got ignored by Microsoft Edge (in 2018)
+perhaps due to Microsoft Edge using non-compliant SDP \"plan B\" format;
+from comment in Mozilla bug #1164187:
+\"Edge doesn't retransmit at all if the receiver does not support required ssrc multiplexed rtx\".
+""";
+	rdfs:seeAlso <https://webrtcglossary.com/rtx/>,
+		<https://bugzilla.mozilla.org/show_bug.cgi?id=1164187#c19>,
+		<https://github.com/jitsi/lib-jitsi-meet/commit/190a9e4>,
+		<https://community.jitsi.org/t/is-firefox-support-on-the-roadmap/29307/15>,
+		<https://wiki.asterisk.org/wiki/display/AST/WebRTC+User+Experience+Improvements#WebRTCUserExperienceImprovements-RTPPacketRetransmission>.
+	sioc:previous_version <https://datatracker.ietf.org/doc/draft-ietf-avt-rtp-retransmission/>;
+	foaf:homepage <https://datatracker.ietf.org/doc/rfc4588/>;
+	owl:sameAs <urn:ietf:rfc:4588>.
+
+# ### Signalling
+
+:matrix
+	a doap:Specification;
+	skos:prefLabel "Matrix";
+#	rdfs:seeAlso <https://matrix.org/>.
+
+:sip
+	a skos:Concept;
+	skos:prefLabel "SIP";
+	rdfs:seeAlso <https://webrtcglossary.com/sip/>.
+
+:xmpp
+	a skos:Concept;
+	skos:prefLabel "XMPP";
+	rdfs:seeAlso <https://webrtcglossary.com/xmpp/>.
+
+# ### Session Description
+
+:sdp-jsep
+	a doap:Specification;
+	skos:prefLabel "JSEP";
+	dc:abstract "Javascript Session Establishment Protocol (JSEP)";
+	dc:description "Official WebRTC SDP syntax for signalling media sources, also known as \"unified plan\".";
+	dc:comment """
+Unified plan was initially proposed in draft-roach-mmusic-unified-plan-00,
+which was absorbed into draft-roach-mmusic-unified-plan and became IETF RFC 4588.
+
+Used in Gecko-based web browsers.
+Used in recent WebKit-based web browsers.
+Used in recent Blink-based web browsers (since release 72).
+""";
+	rdfs:seeAlso <https://bugs.chromium.org/p/chromium/issues/detail?id=857003>,
+		<https://webrtcglossary.com/unified-plan/>;
+	sioc:previous_version <https://datatracker.ietf.org/doc/draft-ietf-rtcweb-jsep/>;
+	foaf:page <https://datatracker.ietf.org/doc/draft-roach-mmusic-unified-plan/>;
+	foaf:homepage <https://datatracker.ietf.org/doc/rfc4588/>;
+	owl:sameAs <urn:ietf:rfc:4588>.
+
+:sdp-planb
+	a doap:Specification;
+	skos:prefLabel "SDP \"plan B\"";
+	dc:abstract "unofficial legacy \"plan b\" WebRTC SDP syntax for signalling multiple media sources";
+	dc:comment """
+Historically used in WebKit-based web browsers.
+Supported in Blink-based web browsers (but unused by default since release 72).
+""";
+	rdfs:seeAlso <https://bugs.chromium.org/p/chromium/issues/detail?id=857004>,
+		<https://webrtcglossary.com/plan-b/>;
+	foaf:homepage <https://www.ietf.org/archive/id/draft-uberti-rtcweb-plan-00.txt>.
+
+# ## licenses
+
+:agpl_3
+	a spdx:License;
+	spdx:licenseId "AGPL-3.0";
+	owl:sameAs <http://spdx.org/licenses/AGPL-3.0>.
+
+:apache_2
+	a spdx:License;
+	spdx:licenseId "Apache-2.0";
+	owl:sameAs <http://spdx.org/licenses/Apache-2.0>.
+
+:expat
+	a spdx:License;
+	spdx:licenseId "MIT";
+	owl:sameAs <http://spdx.org/licenses/MIT>.
+
+:gpl_2
+	a spdx:License;
+	spdx:licenseId "GPL-2.0";
+	owl:sameAs <http://spdx.org/licenses/GPL-2.0>.
+
+:gpl_3
+	a spdx:License;
+	spdx:licenseId "GPL-3.0";
+	owl:sameAs <http://spdx.org/licenses/GPL-3.0>.
+
+:isc
+	a spdx:License;
+	spdx:licenseId "ISC";
+	owl:sameAs <http://spdx.org/licenses/ISC>.
+
+:lgpl_3
+	a spdx:License;
+	spdx:licenseId "LGPL-3.0";
+	owl:sameAs <http://spdx.org/licenses/LGPL-3.0>.