verify if a link start with http, before creating it as link

[pvgenuchten]

ispartof in dc is added as a link in pycsw (as related record), but it is often populated with a string (journal title)

catalogue should not create links if they don't start with http

however it could be a local link in the catalogue, a component could verify if the string is known to the catalogue, if so, link it anyway

3 link options:

• start with http > display link
• string > is a identification of a local record? > display as link
• string > just text > display as text

[pvgenuchten]

notice that with link liveliness assessment this link will be flagged as invalid anyway

[pvgenuchten]

local links are retrieved locally, remote links are checked against liveliness api