scholid 0.2.1

Bug fixes

• Rejected identifiers containing invisible characters, such as soft hyphens and byte order marks, in is_scholid() and classify_scholid(). normalize_scholid(), detect_scholid_type(), and extract_scholid() now remove those characters before normalizing or matching.

• Fixed detect_scholid_type() reporting bare 8-digit PMIDs such as 29456894 as issn when their digits happened to pass the ISSN checksum. Bare compact strings are now detected as ISSN only with a hyphen (2434-561X) or an ISSN label, so a bare 2434561X is no longer detected. normalize_scholid(x, "issn") is unchanged.

Internal improvements

• Sped up classify_scholid(), detect_scholid_type(), and extract_scholid() by checking whole vectors instead of one string at a time.

Documentation

• Corrected the DOI case guidance in the definitions vignette: DOI names are case-insensitive for ASCII letters, and scholid preserves case when validating and normalizing them.

scholid 0.2.0

New identifier types

The package now supports 20 identifier types (up from 7 in 0.1.1). Each type provides structural validation, normalization from URLs and labels, and extraction from free text via the existing is_scholid(), normalize_scholid(), extract_scholid(), classify_scholid(), and detect_scholid_type() APIs.

New types in this release:

• ROR — Research Organization Registry iDs (checksum-validated)
• RRID — Research Resource Identifiers
• SWHID — Software Heritage persistent identifiers
• OpenAlex — OpenAlex entity keys (W, A, S, …)
• bibcode — SAO/NASA ADS bibliographic codes
• ISNI — International Standard Name Identifier (compact form; hyphenated ORCID-shaped strings remain orcid)
• ARK — Archival Resource Keys (ark:/NAAN/Name)
• UniProt — UniProtKB accessions
• refseq — NCBI RefSeq accessions (versioned)
• sra — INSDC Sequence Read Archive accessions (SRR, SRX, SRP, …)
• geo — NCBI GEO accessions (GSE, GSM, GPL, GDS)
• bioproject — INSDC BioProject accessions (PRJNA, PRJEB, …)
• assembly — INSDC genome assembly accessions (GCA_, GCF_, versioned)

Identifier definitions and validation rules are documented in the scholid_definitions vignette.

Internal improvements

• Introduced a central identifier registry as the single source of truth for type names, classification order, extraction patterns, and per-type metadata.
• Refactored per-type implementations to reduce duplication; exported APIs dispatch by naming convention (is_<type>, normalize_<type>, extract_<type>).
• Optimized classify_scholid() and detect_scholid_type() to avoid redundant work when resolving types.

scholid 0.1.1

Bug fixes

• Tightened normalization and validation behavior for checksum-based identifiers.
• Improved consistency between detection, normalization, and validation for ISBN, ORCID, DOI, PMCID, and arXiv identifiers.
• Fixed several edge cases in identifier parsing and canonicalization.

scholid 0.1.0

Initial release.