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<center><font color='#663366' size='+3'><strong> Happy birthday MMark IV is the name of the [[LuaTeX]]-aware part of ConTeXt; that is, when you use ConTeXt over the LuaTeX engine instead of PDFTeX or XeTeX.! </strong></font></center>&nbsp;You run it with

<div class='floatright'>[http://live.contextgarden.net/.hahaha/MKIV.avi < context>\starttext\externalfigure[/opt/local/texmf/tex/context/sample/.hahaha/MKIV.png]\stoptext</context>]<font size='+1'><strong>''Accelerate to Mark IV!''</strong></font></div>Today is the birth date of Mark IV, the coming of which we have been longing for since many years.filename

Mark IV is It takes advantage of the name amazing capabilities of the [[LuaTeX]]-aware part and opens up a whole new world of ConTeXt; that ispossibilities, when you use ConTeXt over the LuaTeX engine instead of PDFTeX or XeTeX. You run it in particular with <code>texexec --lua</code>fonts.

In the distribution the MkIV files have suffix 'mkiv'. There are also files with suffix 'mkvi' and more will follow. The first public beta has been released on the 6th of August, 2007 most significant difference is that these files use a different (and still somewhat experimental) syntax. == Installation and maintenance == The Mark IV code needs to be configured before it is readily available on usable. [[http:Running Mark IV|This page]] explains how to do that.  == Troubleshooting == The environment variable TEXINPUTS has to be empty or unset. If not, you can get errors about "file/module/livewhatever not found".contextgarden.net/ ConTeXt Live] TEXINPUTS can *always* be a problem and really should not be used at all any more. It takes advantage of is a historical environment variable from the amazing capabilities of LuaTeX nineties, and opens up it overrules just about every path in a whole new world of possibilitiesmodern texmf tree. If you need something special, in particular with fontsuse TEXMFLOCAL or TEXMFPROJECT instead.

Here are some examples of cool stuff you can do with Mark IV ([http://live.contextgarden.net/ test it!]). 

==== Good ol' typescripts ==== Of course, Mark IV allows you typescripts as you've always done; for example: <texcode>\usetypescript[palatino][texnansi]\setupbodyfont[palatino,12pt]effe fietsen 2: \input tufte $\sqrt{2}$ \eogonek \sc effe fietsen 2: \input tufte $\sqrt{2}$ \eogonek</texcode> That's as simple as using a traditional ConTeXt typescript! But ... how is it any different, then? Well, the difference This is that detailed in Mark IV, we can use an Opentype font directly, so that what is done here: when we want to use Palatino, the [[TeX GyreFonts in LuaTeX]] equivalent (“Pagella”) is called and we can use its Opentype “features”; read on. ==== Opentype features ====

A “feature”, in the Opentype jargon, is a set of rules describing changes in the appearance of the text. Hmm, that's not very precise. Let's show some examples. First of all, you have to know that features are referred to with 4-letteres tag. One of them is ‘smcp‘, for “small caps“. Let's consider the following Mark IV-only === More sample code:===

<texcode>\definefontfeature[smallcaps][language=DFLT,script=latn,smcp=yes]\font\palasmallcaps=texgyrepagella-regular*smallcaps\palasmallcaps This is a text in small capitals.</texcode> Here you basically define a Other examples of Lua(Mark IVTeX) feature with the name ”smallcaps”, and associate it with the (Opentype) feature “smcp”. You have code are to specify with script you want to use it; scripts in Opentype are also tagged with four letters, and “latn” is of course Latin. Then you define a TeX font with that feature. You can see what features are defined in a particular font with the following bit of code <texcode>\ctxlua{ fontname = 'texgyrepagella-regularbe found on [[User:Luigi.otfscarso#Luatex_examples|Luigi'  tfmdata = fonts.tfm.read_and_define("files user page]] as well as [http:" //luatex.bluwiki. fontname, 655360) font = tfmdata.shared.otfdata if font then gsubfeatures = fonts.otf.analyze_features(font.gsub) gposfeatures = fonts.otf.analyze_features(font.gpos) end  if gsubfeatures then table.sort(gsubfeatures) tex.sprint("\\rm GSUB featurescom/ http: \\tt ") for _, feat in ipairs(gsubfeatures) do tex//luatex.sprint(feat) texbluwiki.sprint(' ') end else tex.sprint("\\rm No GSUB features") end tex.sprint("\\par")  if gposfeatures then tex.sprint("\\rm GPOS features: \\tt ") table.sort(gposfeatures) for _, feat in ipairs(gposfeatures) do tex.sprint(feat) tex.sprint(' ') end else tex.sprint("\\rm No GPOS features") end}<com/texcode>]