sirext

http://t.me/sirextt/247: link to namespace URI +1+1

http://t.me/sirextt/347: link to namespace URI +1+1

http://t.me/sirextt/247# link to namespace URI +1+1

https://sireneld.io/vocab/sirext# link to namespace URI +1+1

http://t.me/sirextt/265: link to namespace URI +1+1

Add alternative URI
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