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What the state of Shape Expressions means to the working group

From: Peter F. Patel-Schneider <pfpschneider@gmail.com>
Date: Mon, 23 Mar 2015 08:56:53 -0700
Message-ID: <551037C5.4@gmail.com>
To: RDF Data Shapes Working Group <public-data-shapes-wg@w3.org>
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I think that there are two things to be learned from the state of Shape
Expressions.

First, none of the implementations of Shape Expressions have much to say to
the working group. Implementations of the member submission are
ill-founded. Implementations of the axiomatization are unstable and produce
counter-intuitive results. Implementations of the regular bag expressions
account are for something that is very different from SHACL.

Second, recursive shape definitions produce problems. To tame these
problems almost certainly requires limiting where recursion can appear. It
may be difficult to determine whether the limitations are sufficient. If
will probably be difficult to explain these limitations to users.

peter
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Received on Monday, 23 March 2015 15:57:23 UTC

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