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3.2.3 Creating output file metadata
In addition to being shown in the printed output, \header variables
are also used to set metadata for output files. For example, with PDF
files, this metadata could be displayed by PDF readers as the
properties of the PDF file. For each type of output file, only the
\header definitions of blocks that define separate files of that
type, and blocks higher in the block hierarchy, will be consulted.
Therefore, for PDF files, only the \book level and the top level
\header definitions affect the document-wide PDF metadata, whereas
for MIDI files, all headers above or at the \score level are used.
For example, setting the title property of the header block
to ‘Symphony I’ will also give this title to the PDF document, and use
it as the sequence name of the MIDI file.
\header {
title = "Symphony I"
}
If you want to set the title of the printed output to one value, but have the
title property of the PDF to have a different value, you can use
pdftitle, as below.
\header {
title = "Symphony I"
pdftitle = "Symphony I by Beethoven"
}
The variables title, subject, keywords,
subtitle, composer, arranger, poet, author
and copyright all set PDF properties and can all be prefixed with
‘pdf’ to set a PDF property to a value different from the printed output.
The PDF property Creator is automatically set to ‘LilyPond’ plus
the current LilyPond version, and CreationDate and ModDate are
both set to the current date and time. ModDate can be overridden by
setting the header variable moddate (or pdfmoddate) to a
valid PDF date string.
The title variable sets also the sequence name for MIDI. The
midititle variable can be used to set the sequence name
independently of the value used for typeset output.
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