Alan Stone wrote:
> Hi,
>
> (1) --mode=modelist
>
> (1.1) Is there a limit to the number of modes in modelist ?

no, just what the console and memory permit

> (1.2) Is there a way to call the modelist and submit it to conditional
> testing within ConTeXt ? For example, to lookup (true/false) the
> presence of modes containing/starting with (an) alphannumeric
> string(s) ?

\doifmodeelse{somemode} { } { } etc etc etc

> (2) --modefile=file
>
> (2.1) What's the syntax of a modefile ?

this concerns examodes stuff that we use for process control at pragma

> (2.2) How does ConTeXt handle a modefile ? Are the modes parsed into a
> modelist ( re: question 1.2 ) ?

best use ctx files instead, like in

== somefile.ctx ===

<?xml version='1.0' standalone='yes'?>

<ctx:job>
    <ctx:preprocess/>
    <ctx:flags>
        <ctx:flag>texengine=luatex</ctx:flag>
        <ctx:flag>interface=en</ctx:flag>
    </ctx:flags>
    <ctx:process>
        <ctx:resources>
            <ctx:mode>proofing</ctx:mode>
            <ctx:environment>somestyle.tex</ctx:environment>
        </ctx:resources>
    </ctx:process>
    <ctx:postprocess/>
</ctx:job>

texexec .... --ctx=somefile