query: Returns an answer to a query hash

In jhpoelen/reston: a biodiversity dataset tracker

Description

Internally, an answer is retrieved by appending the relative path of the query hash provided by hash2path to the url endpoint:

Usage

query(query_hash = first_version_query_hash(),
  hash2url = hash2url_ia_biodiversity_dataset_archive)

Arguments

query_hash	query_hash explicitly specify version to start with, by default, the first version is queried.
hash2url	function that maps a query hash to a url

Details

https://example.org/hash/path

where:

• https://example.org/ is the url endpoint

• some/path is the query hash path generated from query hash by hash2path

Value

an answer in the form a content hash

See Also

https://github.com/bio-guoda/preston/blob/master/architecture.md#simplified-hexastore#

https://archive.org/details/biodiversity-dataset-archives

https://preston.guoda.bio

Examples

 first_version <- query()
 # "hash://sha256/c253a5311a20c2fc082bf9bac87a1ec5eb6e4e51ff936e7be20c29c8e77dee55"

jhpoelen/reston documentation built on April 11, 2020, 11:51 a.m.