shex/Lobby

Shape Expressions

jessevdam

@jessevdam_gitlab

after removing the extends and abstract and 2 types of errors caused by my export function, then it is to big causing a network error

Eric Prud'hommeaux

@ericprud

@labra , are you around to update your parser? it doesn't accept '@'s after EXTENDS

@jessevdam_gitlab , until we update that, you may have to go back and forth between EXTENDS foo and EXTENDS @foo

jessevdam

@jessevdam_gitlab

Yah, as soon I have time I will make sure that it can be correctly parsed and fix the other 2 types of export errors in my code.

Eric Prud'hommeaux

@ericprud

i think i killed the visualizer with my experiments

Jose Emilio Labra Gayo

@labra

Ops, Indeed I need to update my parser...where is the latest grammar that you are using that contains the EXTENDS keyword?

Denny Vrandečić

@vrandezo_twitter

Does someone have a link to an intro in using ShEx for creating forms?

Eric Prud'hommeaux

@ericprud

@labra , i'm cleaning up the grammar/shex2.1 branch now, but it might involve reworking vistitors

(do you visit or listen?)

@vrandezo_twitter , i've got a sample webapp; i'll dig it up

Denny Vrandečić

@vrandezo_twitter

yay! thanks

Eric Prud'hommeaux

@ericprud

@vrandezo_twitter , i added https://ericprud.github.io/shex-form/?manifestURL=examples/manifest.json to the Tools section of shex.io

Denny Vrandečić

@vrandezo_twitter

do you have a bit of doc on how to use it? I tried copying my ShEx file into the upper left thing, set it to ShexC, but it confuses me afterwards

ah got it to work

always after I ask the question! :D

cool! thanks

Denny Vrandečić

@vrandezo_twitter

When I have a single possible value, I still get a drop down. Shouldn't I be using the ns:property [ ns:entity ] ; pattern to say I want a specific property-value pair to exist?

Eric Prud'hommeaux

@ericprud

hmm, that makes sense. i built it as a proof of concept so there's a lot that could be added

probably want a special case for a nc.values.length === 1 in https://github.com/ericprud/shex-form/blob/master/index.js#L570-L576 ,@vrandezo_twitter

ericprud @ericprud wonders if that is a more general nick, a la vrandezo_(tw|g)itter

Denny Vrandečić

@vrandezo_twitter

I'll try it out myself, but just asking in case someone sees it an knows the answer from the top of their head: following the example in the primer http://shexspec.github.io/primer/ , can I have a shape that says "if state is assigned, assignee must have a value, if it is unassigned, it must not". Do I do this with a choice operator?

Jose Emilio Labra Gayo

@labra

I think what you want to mode is an IF-THEN-ELSE pattern, at this moment it is not part of the ShEx syntax but it can be emulated with the AND, NOT and OR operators given that "IF p THEN q ELSE r" is logically equivalent to "(NOT p OR q) AND (p OR r)

I played a little bit with the example you give and you can find it running here

The ShEx could be something like:

PREFIX : <http://ex.example/#>

:IssueShape { 
  a [ :Issue ] ;
} 
AND 
( NOT { :state [:assigned ] } OR { :assignee @:Value }) 
AND 
( { :state [:assigned ] } OR { :assignee @:Value {0,0} } )

:Value { a [ :Value ] }

:Assigned [:assigned ]

Eric Prud'hommeaux

@ericprud

nice

Denny Vrandečić

@vrandezo_twitter

Thanks @labra ! It is cool that it works, I guess I'll need a compiler with that as output :D

Jose Emilio Labra Gayo

@labra

In my opinion the IF-THEN-ELSE pattern could be part of the ShEx language as it is quite common...if it where, the previous definition could be rewritten as:

PREFIX : <http://ex.example/#>

:IssueShape { 
  a [ :Issue ] ;
} AND 
IF { :state [ :assigned ] } 
THEN { :assignee @:Value }  
ELSE { :assignee @:Value {0,0} }

There is an issue proposing that, that we raised some time ago: shexSpec/shex#21, but we were conservative about adding features to ShEx. Maybe now that we have more users we could consider adding it

Denny Vrandečić

@vrandezo_twitter

I find and if / then / else rather limiting

something like a case pattern would be more scalable

but that's just my opinion

added that to the issue thanks for the pointer

Jose Emilio Labra Gayo

@labra

You are right, that could be another option. Thanks for adding the comment.

Blake Regalia

@blake-regalia

is there a "kitchen sink" for ShExC somewhere? I have one locally but the syntax seems to have changed since then and I don't remember where I got it

@ericprud

just found this one, is it outdated? https://github.com/shexSpec/shexTest/blob/master/schemas/kitchenSink.shex

nvm that one seems good still -- lmk if there's any others tho thx :thumbsup:

Eric Prud'hommeaux

@ericprud

i think there's an _all or something like that in the same directory

kitchenSink was pretty feature-complete for 2.0 but i think it's missing 2.1 stuff

Blake Regalia

@blake-regalia

thanks! in ShExC [49] the language says If "." matches and exclusion matches ... which production or where in the grammar does the full stop match?

Eric Prud'hommeaux

@ericprud

oops! exclusion should include a '.' a al:

[50]       exclusion       ::=       '.' '-' (iri | literal | LANGTAG) '~'?

Eric Prud'hommeaux

@ericprud

(@blake-regalia)

Eric Prud'hommeaux

@ericprud

are we meeting today?

we're at https://zoom.us/j/441496948

Eric Prud'hommeaux

@ericprud

shex light "micro spec" is defined as a subset of ShExJ: https://dcmi.github.io/dcap/shex_lite/micro-spec.html

Eric Prud'hommeaux

@ericprud

does anyone have data that conforms to a BioSchemas Gene https://github.com/BioSchemas/bioschemas.github.io/blob/master/_profiles/Gene/0.7-RELEASE.html ?

I'm trying to get my head around the semantics of that schema

(@AlasdairGray , @labra , @andrawaag_twitter)

andrawaag

@andrawaag

FYI: https://github.com/shexSpec/shex/blob/master/meetings/2020/20200527-agenda.md

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