Hi, Joanie. As I understand it, "node parent of" / "node child of" are inverse relations, used to reflect the hierarchy when it is mismatched with the accessible tree, for example, for flat trees or aria-owns in certain implementations as you pointed it out.
"member of" is an abstract relation, used to describe membership-like relations, and doesn't define the accessible tree hierarchy. Also unlike "node child of" the "member of" relation is 1 to many relation. Firefox uses 'member of' relation to point to an atomic region the element belongs to. There's no other cases in Firefox afaik. Thanks. Alex. On Fri, May 19, 2017 at 7:06 AM, Joanmarie Diggs <jdi...@igalia.com> wrote: > Hey all. > > Both ATK/AT-SPI2 and IA2 have "member of" and "node parent of" > accessible relation types. I'm wondering if both are needed. > > If memory serves me, "node parent of" was added as an after-the-fact > inverse relation type for the "node child of" relation type. It's used > in Gtk+ for trees and tables, and in ARIA implementations to map > aria-owns. It seems to me that "node parent of" could also be used for > whatever purpose "member of" was intended for. But I say that as someone > who isn't seeing "member of" used on her platform. > > Given that some folks desire ATK/AT-SPI2 and IA2 be harmonized wherever > possible, I figured I would ask if "member of" serves some helpful > purpose in IA2 implementations. If so, I'm hoping your concrete examples > will help me improve the ATK and AT-SPI2 docs. <smiles> If not, should > we consider deprecating it on our respective platforms? > > Thanks in advance for your thoughts and insight on this matter! > --joanie > _______________________________________________ > Accessibility-ia2 mailing list > Accessibility-ia2@lists.linuxfoundation.org > https://lists.linuxfoundation.org/mailman/listinfo/accessibility-ia2 >
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