Geolexica concepts URI mature enought for reuse in the specs

[sgrellet]

In section terms and reference
For example side with the term Measure, it's tempting to add the URI (https://isotc211.geolexica.org/concepts/2386/).
The TERM ID is 2386
Question is : how mature those URIs scheme are to be reused in a spec ?

[KathiSchleidt]

related to #109 and #96