Perhaps, though maybe something simpler and readable would be easier to get people to use name::string,number of legs::int,height in meters::float,date of

Perhaps, though maybe something simpler and readable would be easier to get people to use name::string,number of legs::int,height in meters::float,date of birth::date(MM/DD/YYYY),email adress::email,website::url joe,2,1.76,12/12/1999,joe@joe.com,https://www.joe.com bob,1,1.84,12/12/1944,bob@vietnam.com,null