Include linking between regions from PAGE

[skurzinz]

regionref

This is a stub issue created from the TEI roundtable during https://readcoop.eu/tuc22/, @hackmanschorsch might have more information.

[skurzinz]

Example from a bogus PAGE document

<Relations>
            <Relation type="link" custom="relationType {value:followed-by;} relationName {value:blah;} id {value:rel;}">
                <RegionRef regionRef="r1l1"/>
                <RegionRef regionRef="line_1648716669386_30"/>
            </Relation>
        </Relations>

These are only able to point to shapes on the same page as PAGE XML’s ids are only unique on a per-page base.

Use case would be e.g. anchoring marginal notes within a tei:p.