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multimarkdown user’s guide

The HTML specification

is maintained by the W3C.

becomes:

The <abbr title="Hyper Text Markup Language">HTML</abbr> specification

is maintained by the <abbr title="World Wide Web Consortium">W3C</abbr>.

Here’s an example using HTML and World Wide Web Consortium

(W3C). The exact behavior will depend on which format you are

viewing this document in. Especially if we use HTML and W3C

again. (Remember that HTML has probably already been used if

you’re viewing a longer version of this document.)

As in PHP Markdown Extra, abbreviations are case-sensitive and

will work on multiple word abbreviations. In this case, MultiMark-

down is tolerant of different variations of whitespace between words.

Operation Tigra Genesis is going well.

[Tigra Genesis]:

An abbreviation with an empty deﬁnition results in an omitted

title

attribute.

There are a few limitations:

• The full name of the abbreviation is plain text only – no Multi-

Markdown markup will be processed.

• Abbreviations don’t do anything when exporting to ODF – there’s

not an equivalent structure there – it would have to be hand

coded. I may or may not get around to this, but pull requests

welcome. ;)

• When exporting to LaTeX, the

acronym

package is used; this means

that the ﬁrst usage will result in

full text (short)

,and subse-

quent uses will result in

short

Fenced Code Blocks

In addition to the regular indented code block that Markdown uses,

you can use “fenced” code blocks in MultiMarkdown. These code

blocks do not have to be indented, and can also be conﬁgured to be

compatible with a third party syntax highlighter. These code blocks

should begin with 3 to 5 backticks, an optional language speciﬁer (if

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using a syntax highlighter), and should end with the same number of

backticks you started with:

# Demonstrate Syntax Highlighting i f you link to highlight . js #

# http : / / softwaremaniacs . org / s oft / highlight / en /

print "Hello ,

world!\n" ;

$a = 0;

while ($a < 10) {

print "$a ...\ n" ;

$a++;

}

Idon’t recommend any speciﬁc syntax highlighter, but have used

the following metadata to set things up. It may or may not work for

you:

html header:

Fenced code blocks are particularly useful when including another

ﬁle (File Transclusion (section )), and you want to show the source of

the ﬁle, not what the ﬁle looks like when processed by MultiMark-

down.

Math

MultiMarkdown 2.0 used ASCIIMathML

to typeset mathematical

57http://www1.chapman.edu/

jipsen/mathml/asciimath.html

equations. There were beneﬁts to using ASCIIMathML, but also some

disadvantages.

When rewriting for MultiMarkdown 3.0, there was no straightfor-

ward way to implement ASCIIMathML which lead me to look for

alternatives. I settled on using MathJax

.The advantage here is that

58http://www.mathjax.org/

the same syntax is supported by MathJax in browsers, and in LaTeX.

This does mean that math will need to be entered into MultiMark-

down documents using the LaTeX syntax, rather than ASCIIMathML.

To enable MathJax support in web pages, you have to include a

link to an active MathJax installation — setting this up is beyond the

scope of this document, but it’s not too hard.

Here’s an example of the metadata setup, and some math:

latex input:

mmd-article-header

Title:

MultiMarkdown Math Example

latex input:

mmd-article-begin-doc

latex footer:

mmd-memoir-footer

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multimarkdown user’s guide

HTML header:

src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML

HTMLorMML">

</script>

An example of math within a paragraph --- \${e}^{i\pi }+1=0\$

--- easy enough.

And an equation on it’s own:

\\[ {x}

{1,2}=\frac{-b\pm \sqrt{{b}^{2}-4ac}}{2a} \\]

That’s it.

Here’s what it looks like in action (if you’re viewing this document

in a supported format):

An example of math within a paragraph — e

+1 =0—easyenough.

And an equation on it’s own:

1,2

b

b2 4ac

That’s it.

In addition to the

\\[ \\]

and

\$ \$

syntax, you can use LaTeX

style “dollar sign” delimiters:

An example of math within a paragraph --- ${e}^{i\pi }+1=0$

--- easy enough.

And an equation on it’s own:

$${x}

{1,2}=\frac{-b\pm \sqrt{{b}^{2}-4ac}}{2a}$$

That’s it.

In order to be correctly parsed as math, there must not be any

space between the

and the actual math on the inside of the delim-

iter, and there must be space on the outside.

Superscripts and Subscripts

You can easily include superscripts and subscripts in MultiMark-

down as well:

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This apartment has an area of 100m^2

One must consider the value of x~z

becomes

This apartment has an area of 100m

One must consider the value of x

The subscript must not contain any whitespace or punctuation.

More complicated exponents and subscripts can be delimited like

this:

y^(a+b)^

x~y,z~

(a+b)

y,z

Glossaries

MultiMarkdown has a feature that allows footnotes to be speciﬁed

as glossary terms. It doesn’t do much for XHTML documents, but

the XSLT ﬁle that converts the document into LaTeX is designed to

convert these special footnotes into glossary entries.

The glossary format for the footnotes is:

[^glossaryfootnote]: glossary: term (optional sort key)

The actual definition belongs on a new line, and can continue on

just as other footnotes.

The

term

is the item that belongs in the glossary. The

sort key

optional, and is used to specify that the term should appear some-

where else in the glossary (which is sorted in alphabetical order).

Unfortunately, it takes an extra step to generate the glossary when

creating a pdf from a latex ﬁle:

1. You need to have the

basic.gst

ﬁle installed, which comes with

the memoir class.

2. You need to run a special makeindex command to generate the

.glo

ﬁle:

makeindex -s ‘kpsewhich basic.gst‘ -o "filename.gls"

"filename.glo"

3. Then you run the usual pdﬂatex command again a few times.

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multimarkdown user’s guide

Alternatively, you can use the code below to create an engine ﬁle

for TeXShop (it belongs in

/Library/TeXShop/Engines

). You can

name it something like

MemoirGlossary.engine

.Then, when process-

ing a ﬁle that needs a glossary, you typeset your document once with

this engine, and then continue to process it normally with the usual

LaTeX engine. Your glossary should be compiled appropriately. If

you use TeXShop

,this is the way to go.

59http://www.uoregon.edu/koch/

texshop/

Note: Getting glossaries to work is a slightly more advanced LaTeX

feature, and might take some trial and error the ﬁrst few times.

#!/bin/

set path = ($path /usr/local/teTeX/bin/powerpc-apple-darwin-current

/usr/local/bin) # This is actually a continuation of the line above

set basefile = ‘basename "$1" .tex‘

makeindex -s ‘kpsewhich basic.gst‘ -o "${basefile}.gls" "${basefile}.glo"

CriticMarkup

What Is CriticMarkup?

CriticMarkup is a way for authors and editors to track changes to doc-

uments in plain text. As with Markdown, small groups of distinctive

characters allow you to highlight insertions, deletions, substitutions

and comments, all without the overhead of heavy, proprietary ofﬁce

suites. http://criticmarkup.com/

CriticMarkup is integrated with MultiMarkdown itself, as well

as MultiMarkdown Composer

. I encourage you to check out the

60http://multimarkdown.com/

web site to learn more as it can be a very useful tool. There is also a

great video showing CriticMarkup in use while editing a document

in MultiMarkdown Composer.

The CriticMarkup Syntax

The CriticMarkup syntax is fairly straightforward. The key thing to

remember is that CriticMarkup is processed before any other Multi-

Markdown is handled. It’s almost like a separate layer on top of the

MultiMarkdown syntax.

When editing in MultiMarkdown Composer, you can have Critic-

Markup syntax ﬂagged in the both the editor pane and the preview

window. This will allow you to see changes in the HTML preview.

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When using CriticMarkup with MultiMarkdown itself, you have

four choices:

• Leave the CriticMarkup syntax in place (

multimarkdown foo.txt

)

• Accept all changes, giving you the “new” document (

multimarkdown

-a foo.txt

)

• Reject all changes, giving you the “original” document (

multimarkdown

-r foo.txt

)

• Attempt to show the changes as highlights. This only works in

HTML, and to use it you ask for the new and original document at

the same time (

multimarkdown -a -r foo.txt

)

CriticMarkup comments and highlighting are ignored when pro-

cessing.

Deletions from the original text:

This is {--is --}a test.

Additions:

This {++is ++}a test.

Substitutions:

This {~~isn’t~>is~~} a test.

Highlighting:

This is a {==test==}.

Comments:

This is a test{>>What is it a test of?<<}.

My philosophy on CriticMarkup

Iview CriticMarkup as two things:

1. A syntax for documenting editing notes and changes, and for

collaborating amongst coauthors.

2. A means to display those notes/changes in the HTML output.

multimarkdown user’s guide

Ibelieve that #1 is a really great idea, and well implemented. #2 is

not so well implemented, largely due to the “orthogonal” nature of

CriticMarkup and the underlying Markdown syntax.

CM is designed as a separate layer on top of Markdown/MultiMarkdown.

This means that a Markdown span could, for example, start in the

middle of a CriticMarkup structure, but end outside of it. This means

that an algorithm to properly convert a CM/Markdown document to

HTML would be quite complex, with a huge number of edge cases to

consider. I’ve tried a few (fairly creative, in my opinion) approaches,

but they didn’t work. Perhaps someone else will come up with a

better solution, or will be so interested that they put the work in to

create the complex algorithm. I have no current plans to do so.

Additionally, there is a philosophical distinction between docu-

menting editing notes, and using those notes to produce a “ﬁnished”

document (e.g. HTML or PDF) that keeps those editing notes intact

(e.g. strikethroughs, highlighting, etc.) I believe that CM is incredibly

useful for the editing process, but am less convinced for the output

process (I know many others disagree with me, and that’s ok. And

to be clear, I think that what Gabe and Erik have done with Critic-

Markup is fantastic!)

There are other CriticMarkup tools besides MultiMarkdown and

MultiMarkdown Composer

,and you are more than welcome to use

61http://multimarkdown.com/

them.

For now, the ofﬁcial MultiMarkdown support for CriticMarkup

consists of:

1. CriticMarkup syntax is “understood” by the MultiMarkdown

parser, and by MultiMarkdown Composer syntax highlighting.

2. When converting from MultiMarkdown text to an output format,

you can ignore CM formatting (probably not what you want to

do), accept all changes, or reject all changes (as above). These are

the preferred choices.

3. The secondary to choice, when exporting to HTML, is to attempt

to show the changes in the HTML output. Because the syntaxes

are orthogonal, this will not always work properly, and will not

always give valid HTML output.

Raw HTML

You can include raw (X)HTML within your document. Exactly what

happens with these portions depends on the output format. You can

also use the

markdown

attribute to indicate that MultiMarkdown pro-

cessing should be applied within the block level HTML tag. This is

48 fletcher t. penney

in addition to the

--process-html

command line option that causes

MultiMarkdown processing to occur within all block level HTML

tags.

For example:

<div>This is

not

MultiMarkdown</div>

<div markdown=1>This

MultiMarkdown</div>

will produce the following without

--process-html

<div>This is

not

MultiMarkdown</div>

<div>This <em>is</em> MultiMarkdown</div>

and with

--process-html

<div>This is <em>not</em> MultiMarkdown</div>

<div>This <em>is</em> MultiMarkdown</div>

However, the results may be different than anticipated when out-

putting to LaTeX or other formats. Normally, block level HTML will

be ignored when outputting to LaTeX or ODF. The example above

would produce the following, leaving out the ﬁrst<

div

>entirely:

This \emph{is} MultiMarkdown

And this with

--process-html

This is \emph{not} MultiMarkdown

This \emph{is} MultiMarkdown

You will also notice that the line breaks are different when out-

putting to LaTeX or ODF, and this can cause the contents of two

div

>tagstobeplacedintoasingleparagraph.

Raw LaTeX/OpenDocument/etc.

You can use HTML comments to include additional text that will

be included in the exported ﬁle without being changed. This can

be used for any export format, which means that each document

can only be conﬁgured for one export format at a time. In other

multimarkdown user’s guide

words, it is highly unlikely that valid raw LaTeX will also be valid

OpenDocument source code.

This will be processed by

MultiMarkdown

<!-- This will not be processed by

MultiMarkdown -->

File Transclusion

File transclusion is the ability to tell MultiMarkdown to insert the

contents of another ﬁle inside the current ﬁle being processed. For

example:

This is some text.

{{some

other

file.txt}}

Another paragraph

If a ﬁle named

some

other

file.txt

exists, its contents will be

inserted inside of this document before being processed by Multi-

Markdown. This means that the contents of the ﬁle can also contain

MultiMarkdown formatted text.

If you want to display the contents of the ﬁle without processing it,

you can include it in a code block (you may need to remove trailing

newlines at the end of the document to be included):

This is some text

‘‘‘

{{relative/path/to/some

other

file.txt}}

‘‘‘

Another paragraph

Transclusion is recursive, so the ﬁle being inserted will be scanned

to see if it references any other ﬁles.

Metadata in the ﬁle being inserted will be ignored. This means

that the ﬁle can contain certain metadata when viewed alone that will

not be included when the ﬁle is transcluded by another ﬁle.

You can use the

[Transclude Base]

metadata to specify where

MultiMarkdown should look for the ﬁles to be included. All ﬁles

must be in this folder. If this folder is not speciﬁed, then MultiMark-

50 fletcher t. penney

down will look in the same folder as the parent ﬁle.

Note: Thanks to David Richards for his ideas in developing sup-

port for this feature.

Wildcard Extensions

Sometimes you may wish to transclude alternate versions of a ﬁle

depending on your output format. Simply use the extension “.*”

to have MMD choose the proper version of the ﬁle (e.g.

foo.tex

foo.fodt

foo.html

,etc.)

Insert a different version of a file here based on export format:

{{foo.

}}

Transclusion Preprocessing

If you want to perform transclusion, without converting to another

format, you can use

mmd

as the output format:

multimarkdown -t mmd foo.txt

This will only perform “basic” transclusion –it does not support

wildcard extensions, since the ﬁnal output format is not known.

Escaped newlines

Thanks to a contribution from Nicolas

,MultiMarkdown has an

62https://github.com/njmsdk

additional syntax to indicate a line break. The usual approach for

Markdown is “space-space-newline” — two spaces at the end of the

line. For some users, this causes problems:

• the trailing spaces are typically invisible when glancing at the

source, making it easy to overlook them

• some users’ text editors modify trailing space (IMHO, the proper

ﬁx for this is a new text editor...)

Nicolas submitted a patch that enables a new option that inter-

prets “\” before a newline as a marker that a line break should be

used:

This is a line.\

This is a new line.

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