I was once involved in a mail conversation about this, where I thought I had some good argument for why dicts may be nice to have, as well as some good arguments against. I repeat them here: Why dicts might be great to have in Web Prolog A. They map naturally to JSON. This might be a great feature…

X.g=Y, a{f:b{g:c}}.f=X. And the same is true for library(assoc). You cannot create a realistic indexed name-value pair datatype with these properties, at least I wouldn’t know how. As shown in a pack, you can use constraints (attributed variables) to realise open dicts and you can probably a…

I use this code to ensure that there are no uninstantiated tags in my dicts from reading JSON: my_json_read_dict(Stream, Dict) :- json_read_dict(Stream, Dict, [value_string_as(atom), end_of_file(end_of_file)]), set_json_dict_tag(json, Dict). set_json_dict_tag(DefaultTag, Term) :- ( is…

Alternatively, use the default_tag option: 13 ?- [library(http/json)]. true. 14 ?- json_read_dict(current_input, Dict, [default_tag(json)]). |: {"a":1} Dict = json{a:1}.

Prolog dictionaries

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Prolog dictionaries

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