MS Office 2010 include free, online version

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Well, so are Mathematica notebooks, which is why I suggested it

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I didn't realize that (I knew that you could export Mathematica formulas to LaTeX, though). Is it reasonably useful outside of Mathematica or an obscure markup language?

[/ QUOTE ]Mathematica notebooks are made up of actual Mathematica functions (and a few comments). For example, here's the FullForm of a cell in a recent notebook I wrote:
<font class="small">Code:[/color]<hr /><pre>Cell[TextData[{
"Apply the method of Lagrange Multiples to find the critical points for ",
Cell[BoxData[
FormBox[
RowBox[{
RowBox[{"f", "(",
RowBox[{"x", ",", "y"}], ")"}], "=",
RowBox[{
RowBox[{
SuperscriptBox["x", "2"], "y"}], "+",
SuperscriptBox["y", "2"]}]}], TraditionalForm]],
FormatType-&gt;"TraditionalForm"],
" subject to ",
Cell[BoxData[
FormBox[
RowBox[{
RowBox[{
SuperscriptBox["x", "2"], "-", "y"}], "=", "1"}], TraditionalForm]],
FormatType-&gt;"TraditionalForm"],
". Give ",
Cell[BoxData[
FormBox[
RowBox[{"(",
RowBox[{"x", ",", "y"}], ")"}], TraditionalForm]],
FormatType-&gt;"TraditionalForm"],
" values."
}], "Exercise",
CellChangeTimes-&gt;{{3.4571121244125*^9, 3.4571122006305*^9}}],</pre><hr />

The output, sans formatting, is:[ QUOTE ]
Apply the method of Lagrange Multiples to find the critical points for f(x,y)=x^2 y+y^2 subject to x^2-y=1. Give (x,y) values.

[/ QUOTE ]It's also given the cell type "Exercise" (which, according to the stylesheet I'm using, is purple text preceded by a purple downward pointing triangle, which starts a cell group), and includes timestamps of when it was modified.


So, to answer your question: The file content is a bit bloated, but no, it's not an obscure markup. That is, unless you consider Mathematica code itself to be obscure.

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http://www.fimfiction.net/story/36641/My-Little-Exalt