I just pushed a fix for this.

In the mean time you could work around this by using
a Lua filter that converts MetaBlocks elements to MetaInlines.

Nathan <nathan.artist-s8PdfxpoPdHk1uMJSBkQmQ@public.gmane.org> writes:

> I'm using another application that outputs MultiMarkdown with a metadata
> block in the following format:
>
> Title: Blah blah blah
> Author: Doo de Doo
> Base Header Level: 1
> Bibliography: Pubs.bib
> Lang: en-GB
>
> Converting this using pandoc -f markdown_mmd -t markdown --standalone we
> get a metadata block in the following format:
>
> ---
> author: |
>   Doo de Doo
> baseheaderlevel: |
>   1
> bibliography: |
>   Pubs.bib
> lang: |
>   en-GB
> title: |
>   Blah blah blah
> ---
>
> Is there any way within pandoc to get rid of the vertical bar and newline
> in the metadata fields so that each metadata field is on a single line like
> in the input file? I know I can pipe the file to something like perl (which
> has been my workaround) but was wondering if there is a way to do it only
> with pandoc? (The vertical bar, or whatever it corresponds to in pandoc's
> AST, causes trouble in epub output by inserting an unwanted p element
> within title and author elements in the title page.)
>
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