Valentina Links on Diagrams
Foreign Key Link
On the following picture you can see how Valentina Studio displays a Foreign Key link. You could see similar diagrams in e.g. MS SQL or MS Access.
Note, that line of the link connects two fields. Line starts at a MANY table field, which is a foreign key, and ends at a ONE table field, which is the primary key.
On the following picture you can see how Valentina Studio displays an ObjectPtr link.
Note, that link starts at a MANY table field, which is ObjectPtr, and ends at the TITLE of the ONE table. This is because there is no primary key field in the ONE table (RecID pseudo-field is used). So we can move line of link only to the TITLE of object. This underlines ObjectPtr-link nature. This is pointer on Object (i.e. Table).