hello-world Example doesn't Follow Schema

[Jason Siefken]

I noticed today that https://github.com/PreTeXtBook/pretext/blob/master/examples/hello-world/hello-world.xml doesn't validate according to the schema because an article must have a <title>.

Is this a bug in the schema or a bug in the example? 

[Rob Beezer]

Thanks for catching that, Jason!

Well, that example is over 10 years old. ;-) It is mostly meant as a place to
throw in some extra stuff for testing, but I tend to use (and encourage) the
sample article for that, since unanticipated side-effects are more likely to
surface (and we are faster than we used to be!).

I could see an argument for a short, unstructured, one-page something, without a
#title. But almost everything structural *requires* a #title, so I'd say the
schema is right, and the example needs a title.

I can catch that (and update the very old code comments), unless you are dying
to do it. Let me know, one way or the other.

Thanks,
Rob

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[Jason Siefken]

I'm happy for you to make the update :-)

PS: this came out of some work I'm doing to get schema validation without JING. Hopefully it ends up being useful.

[Rob Beezer]

On 5/7/26 13:25, Jason Siefken wrote:
> I'm happy for you to make the update :-)

Done. Thanks again for the report.

> PS: this came out of some work I'm doing to get schema validation without JING.
> Hopefully it ends up being useful.

I suspected something bigger was in the preliminary stages. ;-) Yes, that will
be interesting.

Would you like more on your plate? We have constructions we can't express with
a simple parent-child relationship. For example. a #var can appear as a
*descendant* of #webwork, but not just any old place. So it is an
ancestor-descendant relationship, at a variable number of generations. We have
a tool to comment on these, in the "validation-plus" stylesheet. Something to
think about for v2.0.

Rob