I don’t know what happened to my last reply but it should have been this. I’m not sure about this but I suspect that it doesn’t involve parsing. It’s likely that the metapost expects a parameter or parameters to be passed to it which it then assigns to the variable Q in its own procedure. It won’t care what the calling program calls it. I think the arrowhead is probably defined within an arrow class (arrow.h perhaps). Dave Clucas dave.clucas@icloud.com Exploring the World - One cave at a time

On 31 Mar 2018, at 18:00, therion-request@speleo.sk wrote:

Send Therion mailing list submissions to therion@speleo.sk

To subscribe or unsubscribe via the World Wide Web, visit https://mailman.speleo.sk/listinfo/therion or, via email, send a message with subject or body 'help' to therion-request@speleo.sk

You can reach the person managing the list at therion-owner@speleo.sk

When replying, please edit your Subject line so it is more specific than "Re: Contents of Therion digest..."

Today's Topics:

1. Re: scaling line ornamentation - metapost (Bruce Mutton) (Dave Clucas)

----------------------------------------------------------------------

Message: 1 Date: Sat, 31 Mar 2018 09:27:56 +0800 From: Dave Clucas <dave.clucas@icloud.com> To: therion@speleo.sk Subject: Re: [Therion] scaling line ornamentation - metapost (Bruce Mutton) Message-ID: <AE9F115A-8402-4B59-8801-DEBD248FCAEB@icloud.com> Content-Type: text/plain; charset="utf-8"

An HTML attachment was scrubbed... URL: <http://mailman.speleo.sk/pipermail/therion/attachments/20180331/e73a8e70/attachment-0001.html>

------------------------------

Subject: Digest Footer

_______________________________________________ Therion mailing list Therion@speleo.sk https://mailman.speleo.sk/listinfo/therion

------------------------------

End of Therion Digest, Vol 147, Issue 32 ****************************************