There are two types of links in PDF: a link to a specific position in the same PDF document, and a link to an external document. The internal-destination property of fo:basic-link indicates to link to a position in the same document. Its destination may be either an ID or a page number. The external-destination property indicates to link to an external document. Its destination may be either an external file or a website.
Linking to an internal destination
Linking to an ID：Specify internal-destination="Link-01" on the link; specify id="Link-01" on the link’s destination.
Linking to a page number (page 2)：-ah-internal-destination: 2;
Linking to a page number (page 2) and setting the display ratio (200%)：-ah-internal-destination: '2#zoom=200'