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Online Resolution and Registry Validation

Introduction

This vignette explains what it means to validate scholarly identifiers against external registries and how scholidonline relates to scholid.

When working with identifiers programmatically, it is essential to distinguish between three levels of validity:

Structural validity
Checksum validity
Registry validity

scholid operates at the structural (and, where applicable, checksum) level.

scholidonline operates at the registry level.

Structural vs Registry Validity

Structural Validity

Structural validity answers:

Does this string match the formal grammar of an identifier system?

Example:

scholid::is_scholid(
  "10.1000/182",
  type = "doi"
  )
#> [1] TRUE

Structural validation uses regular expressions and, where applicable, checksum algorithms (e.g., ORCID).

It does not require internet access.

It does not confirm existence.

Registry Validity

Registry validity answers:

Does this identifier exist in an external authority?

For example:

Does this DOI resolve via doi.org or Crossref?
Does this PMID exist in PubMed?
Is this ORCID iD present in the ORCID registry?

Example:

scholidonline::id_exists(
  "10.1000/182",
  type = "doi"
  )

Registry validation:

Requires internet access
Depends on external APIs
May be affected by rate limits or temporary outages
Can change over time

A structurally valid identifier may still fail registry validation.

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.