## Create a new nexml object with a single metadata element:
modified <- meta(property = "prism:modificationDate", content = "2013-10-04")
nex <- add_meta(modified) # Note: 'prism' is defined in nexml_namespaces by default.
## Write multiple metadata elements, including a new namespace:
website <- meta(href = "http://carlboettiger.info",
rel = "foaf:homepage") # meta can be link-style metadata
nex <- add_meta(list(modified, website),
namespaces = c(foaf = "http://xmlns.com/foaf/0.1/"))
## Append more metadata, and specify a level:
history <- meta(property = "skos:historyNote",
content = "Mapped from the bird.orders data in the ape package using RNeXML")
data(bird.orders)
nex <- add_trees(bird.orders) # need to have created a trees block first
nex <- add_meta(history,
nexml = nex,
level = "trees",
namespaces = c(skos = "http://www.w3.org/2004/02/skos/core#"))
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