I'm not an academic and have extensive experience with parsing.

But for whataver reason, VPAs have slipped under my radar until very recently - I only discovered them a few weeks ago and have been quite fascinated. Have been reading a lot (the citations I've given are some of my recent reading), and am currently working on a visibly pushdown parser generator. I'm more interested in the practical use than the acamedic side, but there's little resources besides academic papers for me to go off.

Thought it might be interesting to share in case others like me have missed out on VPAs.

(Properly formatted) XML can be parsed, and streamed, by a visibly-pushdown automaton[1][2].

"Visibly Pushdown Expressions"[3] can simplify parsing with a terse syntax styled after regular expressions, and there's an extension to SQL which can query XML documents using VPAs[4].

JSON can also be parsed and validated with visibly pushdown automata. There's an interesting project[5] which aims to automatically produce a VPA from a JSON-schema to validate documents.

In theory these should be able outperform parsers based on deterministic pushdown automata (ie, (LA)LR parsers), but they're less widely used and understood, as they're much newer than the conventional parsing techniques and absent from the popular literature (Dragon Book, EAC etc).

[1]:https://madhu.cs.illinois.edu/www07.pdf

[2]:https://www.cis.upenn.edu/~alur/Cav14.pdf

[4]:https://web.cs.ucla.edu/~zaniolo/papers/002_R13.pdf

[3]:https://homes.cs.aau.dk/~srba/courses/MCS-07/vpe.pdf

[5]:https://www.gaetanstaquet.com/ValidatingJSONDocumentsWithLea...

That's not going to happen, but there's alternative research such as [1] where we get rid of the clock and use self-timed circuits.

[1]:https://arc.cecs.pdx.edu/

My luggage was missing when I landed at KIX.

But it wasn't the airport's fault - my luggage was still in Amsterdam.

Arrived <24 hours later and they delivered it to my hotel in Osaka.