From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.comp.tex.context/71985 Path: news.gmane.org!not-for-mail From: "Thomas A. Schmitz" Newsgroups: gmane.comp.tex.context Subject: Re: xml and lua again Date: Fri, 28 Oct 2011 12:48:38 +0200 Message-ID: <4EAA8886.40204@uni-bonn.de> References: <4EA2F34E.6080202@uni-bonn.de> <4EA53B44.1040105@wxs.nl> <4EA55792.9090408@uni-bonn.de> <4EA5598A.4060109@wxs.nl> <4EA599BE.2050304@uni-bonn.de> <4EA5B2F2.2050700@wxs.nl> <4EA684D9.2040702@uni-bonn.de> <4EA68CB4.30809@wxs.nl> <4EA68F04.4090706@uni-bonn.de> <4EA9231F.6080001@uni-bonn.de> <4EA93348.6030308@uni-bonn.de> <4EA93AE0.2000805@wxs.nl> <4EAA4A61.4090707@uni-bonn.de> <83BD5F74-4BB7-41D2-9C1E-F5F31084E6AC@gundla.ch> <4EAA51D6.3050909@uni-bonn.de> <4EAA6E5A.8010606@wxs.nl> Reply-To: mailing list for ConTeXt users NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit X-Trace: dough.gmane.org 1319798939 22413 80.91.229.12 (28 Oct 2011 10:48:59 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Fri, 28 Oct 2011 10:48:59 +0000 (UTC) To: Hans Hagen , mailing list for ConTeXt users Original-X-From: ntg-context-bounces@ntg.nl Fri Oct 28 12:48:54 2011 Return-path: Envelope-to: gctc-ntg-context-518@m.gmane.org Original-Received: from balder.ntg.nl ([195.12.62.10]) by lo.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1RJjzY-0001vy-9V for gctc-ntg-context-518@m.gmane.org; Fri, 28 Oct 2011 12:48:52 +0200 Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 1BBE6CB0BE; Fri, 28 Oct 2011 12:48:46 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at balder.ntg.nl Original-Received: from balder.ntg.nl ([127.0.0.1]) by localhost (balder.ntg.nl [127.0.0.1]) (amavisd-new, port 10024) with LMTP id UT3l8rnq6zt2; Fri, 28 Oct 2011 12:48:43 +0200 (CEST) Original-Received: from balder.ntg.nl (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 5C0A9CB0AD; Fri, 28 Oct 2011 12:48:43 +0200 (CEST) Original-Received: from localhost (localhost [127.0.0.1]) by balder.ntg.nl (Postfix) with ESMTP id 0957BCB0AD for ; Fri, 28 Oct 2011 12:48:42 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at balder.ntg.nl Original-Received: from balder.ntg.nl ([127.0.0.1]) by localhost (balder.ntg.nl [127.0.0.1]) (amavisd-new, port 10024) with LMTP id nA4JJVDmNp34 for ; Fri, 28 Oct 2011 12:48:40 +0200 (CEST) Original-Received: from filter2-ams.mf.surf.net (filter2-ams.mf.surf.net [192.87.102.70]) by balder.ntg.nl (Postfix) with ESMTP id 20034CB0AA for ; Fri, 28 Oct 2011 12:48:40 +0200 (CEST) Original-Received: from uni-bonn.de (mail.uni-bonn.de [131.220.15.113]) by filter2-ams.mf.surf.net (8.14.3/8.14.3/Debian-5+lenny1) with ESMTP id p9SAmdt9018570 for ; Fri, 28 Oct 2011 12:48:39 +0200 Original-Received: from [87.178.37.233] (account tschmit1@uni-bonn.de HELO [192.168.0.3]) by fe2.uni-bonn.de (CommuniGate Pro SMTP 5.2.12) with ESMTPSA id 2532081; Fri, 28 Oct 2011 12:48:39 +0200 User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.23) Gecko/20110922 Thunderbird/3.1.15 In-Reply-To: <4EAA6E5A.8010606@wxs.nl> X-Bayes-Prob: 0.0001 (Score 0, tokens from: @@RPTN) X-CanIt-Geo: ip=131.220.15.113; country=DE; region=07; city=Bonn; latitude=50.7333; longitude=7.1000; http://maps.google.com/maps?q=50.7333,7.1000&z=6 X-CanItPRO-Stream: uu:ntg-context@ntg.nl (inherits from uu:default, base:default) X-Canit-Stats-ID: 0rFOaMDgz - e2f3450ffb1b - 20111028 X-Scanned-By: CanIt (www . roaringpenguin . com) on 192.87.102.70 X-BeenThere: ntg-context@ntg.nl X-Mailman-Version: 2.1.12 Precedence: list List-Id: mailing list for ConTeXt users List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: ntg-context-bounces@ntg.nl Errors-To: ntg-context-bounces@ntg.nl Xref: news.gmane.org gmane.comp.tex.context:71985 Archived-At: On 10/28/11 10:56, Hans Hagen wrote: > Just switch to philosopher mode for a while and ask yourself what > implications that would have in the rather fuzzy world of printing. > > What is a 'real' dimension? What we call points (pt) is in other > application also called points but happens to be basepoints in our > universe (bp). Also, imagine that in good american tradition the > dimension would have been inches while we all moved on to meters ... > > So, Knuth foresaw this (and also wanted predictable calculations and > wanted to avoid unportable floating points) so he came up with his own > unit: scaled points. So, a \dimen is just a \count but consider it > tagged to show you pt for convenience when printed (\the) and the parser > permits you to enter these numbers as pt/bp/dd/cc/cm/mm etc. > > At the lua end all are just integers (with some limited size but that > might change as Taco and I want to play a bit with adding a couple of > bytes and see to what extent that will break things). > > In metapost the internal unit is bp (because it targets at postscript) > and there cm, mm etc are just variables that one multiplies with so > there you can change the universe by just saying "in := cm". > > Skips are another story (not to speak of boxes as we do have a dimendef > but not a boxdef of inserts which are yet another class of animals). Thanks for this philosophical explanation - I guess I'll have to reread these passages in the TeX book. I'm looking forward to your experiments :-) Thomas ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________