how does one combine outputs of independent calls to `pub_chunks`

[sckott]

ah right, we have the following option:

1. pass in many files or XML character strings in a list, or

x <- system.file("examples/elsevier_1.xml", package = "pubchunks")
z <- system.file("examples/hindawi_1.xml", package = "pubchunks")
pub_chunks(list(x, z), "title")

But this should work too:

2. many calls to pub_chunks combined into a list

but fails right now

x <- system.file("examples/elsevier_1.xml", package = "pubchunks")
z <- system.file("examples/hindawi_1.xml", package = "pubchunks")
pub_tabularize(list(pub_chunks(x, "title"), pub_chunks(z, "title")))
#> Error in if (attr(x, "ft_data")) { : argument is of length zero

[sckott]

done in 37f676d