Issue 3: Virtual Structures -- Progress?

Issue 3: Virtual Structures -- Progress?

I know of only one implementation

"Virtual structures in PHIDIAS": McCall, et al., ECHT90

... and one theoretical mention

"Retrieval links": DeRose, HT89

Technically, links in HyperCard are virtual

But are probably seldom virtual in spirit
"GOTO Card#1675" versus"GOTO FirstOf(FullTextSearch(AllCards, 'Xanadu'))"

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