Erratum in PROV-N Example 14

Hi,

The first of the remaining example in [Example 14] shows `used(ex:act2)` which is invalid according to the additional semantic rules (Section 3.7.5) since at least one of id, entity, time, and attributes MUST be present.

I believe this example should be `used(ex:act2, ar3:0111)`.

Also, a very minor point, but the third of the remaining examples should have a space after the comma for consistency: `used(a1, e1, -, [ex:fct="load"])`

[Example 14]: https://www.w3.org/TR/2013/REC-prov-n-20130430/#example_14


Regards,

John Walker
Principal Consultant & co-founder

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