View source: R/prefixed-uris.R
expand_prefix | R Documentation |
Substitutes the namespace prefix in the input vector of strings with the corresponding namespaces.
expand_prefix(x, namespaces = NULL)
x |
a character vector of potentially namespace-prefixed strings |
namespaces |
a named vector of namespaces, with namespace prefixes being the names. A "base" namespace with an empty name can be included. If not provided, or if empty, the input vector is returned as is. |
Namespace prefixes are expected to be separated by one or more semicolons. Prefixes that cannot be matched to the vector of namespaces will be left as is. For strings that do not have a namespace prefix, the vector of namespaces can contain a base namespace, identified as not having a name, with which these strings will be expanded.
a character vector, of the same length as the input vector
uris <- c("cc:license", "dc:title") ns <- c(dc = "http://purl.org/dc/elements/1.1/", dcterms = "http://purl.org/dc/terms/", dct = "http://purl.org/dc/terms/", cc = "http://creativecommons.org/ns#") # expansion is vectorized expand_prefix(uris, ns) # strings with non-matching or no prefix are left as is uris <- c(uris, "my:title", "title") expand_prefix(uris, ns) # NAs in the input list become NA in the output uris <- c(uris, NA) expand_prefix(uris, ns) # can include a "base" (unnamed) namespace for expanding unprefixed strings ns <- c(ns, "//local/") xuris <- expand_prefix(uris, ns) xuris xuris[uris == "title"] == paste0("//local/", uris[uris == "title"]) # different prefixes may expand to the same result expand_prefix("dcterms:modified", ns) == expand_prefix("dct:modified", ns) # or they may result in different expansions expand_prefix("dc:title", ns) != expand_prefix("dcterms:title", ns)
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