Fetch the Salmon Domain Ontology with caching — fetch_salmon_ontology • metasalmon

Downloads the Salmon Domain Ontology using HTTP content negotiation and caches the response using ETag / Last-Modified headers when available.

Usage

fetch_salmon_ontology(
  url = "https://w3id.org/smn/",
  accept = "text/turtle, application/rdf+xml;q=0.8",
  cache_dir = file.path(tools::R_user_dir("metasalmon", which = "cache"), "ontology"),
  timeout_seconds = 30,
  fallback_urls = c("https://w3id.org/smn")
)

Arguments

url: Ontology URL. Default is the canonical SMN namespace root.
accept: Accept header; defaults to turtle with RDF/XML fallback.
cache_dir: Directory to store cached ontology and headers. Defaults to a persistent user cache path.
timeout_seconds: Numeric timeout in seconds for each HTTP request.
fallback_urls: Optional fallback ontology URLs tried if the primary url fails.

Value

Path to the cached ontology file (character string).