...
other meta information of the post, e.g. categories = c('R',
'Stats')
and mt_keywords = c('knitr', 'wordpress')
, etc
shortcode
a logical vector of length 2: whether to use the shortcode
[sourcecode lang='lang'] which can be useful to WordPress.com users
for syntax highlighting of source code and output; the first element
applies to source code, and the second applies