bhl_getitemmetadata: Return metadata about an item.
In rbhl: Interface to the 'Biodiversity' 'Heritage' Library

You may choose to include a list of the item's pages.

bhl_getitemmetadata(
  itemid = NULL,
  pages = TRUE,
  ocr = FALSE,
  parts = FALSE,
  as = "table",
  key = NULL,
  ...
)

`itemid`	item id (character)
`pages`	return the items pages (`TRUE`/`FALSE`)
`ocr`	(logical) `TRUE` to return the ocr for the item's pages. Setting this to `TRUE` apparently doesn't return any actual ocr text, but leaving parameter here for now.
`parts`	(logical) `TRUE` to return the item's parts. Setting this to `TRUE` apparently doesn't return any parts text, but leaving parameter here for now.
`as`	(character) Return a list ("list"), json ("json"), xml ("xml"), or parsed table ("table", default). Note that `as="table"` can give different data format back depending on the function - for example, sometimes a data.frame and sometimes a character vector.
`key`	Your BHL API key, either enter, or loads from your `.Renviron` as `BHL_KEY` or from `.Rprofile` as `bhl_key`.
`...`	Curl options passed on to `crul::HttpClient()`

## Not run: 
bhl_getitemmetadata('16800', TRUE)
bhl_getitemmetadata('16800', TRUE, as='xml')
bhl_getitemmetadata('16800', TRUE, as='json')
bhl_getitemmetadata('16800', TRUE, as='list')
bhl_getitemmetadata(20419, pages=FALSE, parts=TRUE)

## End(Not run)