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scholidonline

scholidonline provides lightweight online utilities for working with scholarly identifiers in R. It builds on scholid for identifier detection and normalization, and adds minimal-dependency functions to query external registries.

See the full documentation at the scholidonline website.

Installation

Install the released version from CRAN:

install.packages("scholidonline")

Scope

The package focuses on online operations for common identifier systems used in scholarly communication:

DOI
ORCID iD
arXiv
PubMed (PMID)
PubMed Central (PMCID)

It provides registry-backed functionality such as:

Existence checks
Identifier conversion across systems
Basic metadata retrieval
Discovery of linked identifiers

Interface

User-available functions:

Function	Purpose
`scholidonline_types()`	Supported scholidonline identifier types
`scholidonline_capabilities()`	Supported scholidonline capabilities
`id_exists()`	Check whether identifiers exist in their respective registries
`id_convert()`	Convert identifiers across systems (e.g., PMID → DOI)
`id_metadata()`	Retrieve basic structured metadata
`id_links()`	Discover identifiers linked to the same scholarly record

Examples

# List supported scholidonline identifier types
scholidonline::scholidonline_types()

## [1] "arxiv" "doi"   "orcid" "pmcid" "pmid"

# List scholidonline capabilities
scholidonline::scholidonline_capabilities()

##     type operation target               providers default_provider
## 1  arxiv    exists   <NA>             auto, arxiv            arxiv
## 2  arxiv     links   <NA>             auto, arxiv            arxiv
## 3  arxiv      meta   <NA>             auto, arxiv            arxiv
## 4    doi    exists   <NA> auto, doi.org, crossref          doi.org
## 5    doi     links   <NA>          auto, crossref         crossref
## 6    doi      meta   <NA> auto, crossref, doi.org         crossref
## 7    doi   convert   pmid        auto, ncbi, epmc             ncbi
## 8    doi   convert  pmcid        auto, ncbi, epmc             ncbi
## 9  orcid    exists   <NA>             auto, orcid            orcid
## 10 orcid     links   <NA>             auto, orcid            orcid
## 11 orcid      meta   <NA>             auto, orcid            orcid
## 12 pmcid    exists   <NA>        auto, ncbi, epmc             ncbi
## 13 pmcid     links   <NA>        auto, ncbi, epmc             ncbi
## 14 pmcid      meta   <NA>        auto, ncbi, epmc             ncbi
## 15 pmcid   convert   pmid        auto, ncbi, epmc             ncbi
## 16 pmcid   convert    doi        auto, ncbi, epmc             ncbi
## 17  pmid    exists   <NA>        auto, ncbi, epmc             ncbi
## 18  pmid     links   <NA>        auto, ncbi, epmc             ncbi
## 19  pmid      meta   <NA>        auto, ncbi, epmc             ncbi
## 20  pmid   convert    doi        auto, ncbi, epmc             ncbi
## 21  pmid   convert  pmcid        auto, ncbi, epmc             ncbi

# Check if an ID exists online
scholidonline::id_exists(
  "10.1000/182",
  type = "doi"
  )

## [1] TRUE

# Convert identifiers across systems
scholidonline::id_convert(
  "12345678",
  to = "doi",
  from = "pmid"
  )

## [1] "10.1234/2013/999990"

# Retrieve scholarly metadata
out <- scholidonline::id_metadata(
  "10.1038/nature12373",
  type = "doi"
  )

# Show key fields
knitr::kable(out)

input	type	provider	title	year	container	doi	pmid	pmcid	url
10.1038/nature12373	doi	crossref	Nanometre-scale thermometry in a living cell	2013	Nature	10.1038/nature12373	NA	NA	https://doi.org/10.1038/nature12373

# Return identifiers linked to the same scholarly record
out <- scholidonline::id_links(
  "31452104",
  provider = "epmc"
  )

knitr::kable(out)

	query	query_type	linked_type	linked_id	provider
2	31452104	pmid	doi	10.1007/978-1-4939-9752-7_10	epmc

Relationship to scholid

scholid provides dependency-free utilities for detecting, normalizing, classifying, and extracting scholarly identifiers.

scholidonline builds on that foundation and adds online registry queries.

License

MIT

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.