Lua filter to set meta data

["Björn Fisseler" <bjoern.fisseler-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Hi, 

I want to use Pandoc for converting DOCX to HTML. The goal is to convert 
DOCX to Moodle-Books. While understanding the very basic of developing Lua 
filters is relatively easy, I find it has a steep learning curve when you 
want to achieve certain things.

For example, I need to convert a heading level 2 to the meta data element 
title while reducing all other levels by one (h3 > h4, h4 > h5). This is 
the code that I came up with:
function Header(el)
if (el.level > 2) then
el.level = el.level + 1
end
if (el.level == 2) then
title = el.content
end
return el
end

Thing is, it doesn't work as intended and I don't know why. While it 
correctly modifies the heading levels, it won't set the title. Could 
anybody point me to some documentation? Browsing the Pandoc manual didn't 
help me to understand why this wouldn't work.

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