PubIDPubID
IS

ISBN

International Standard Book Number

The ISBN identifies monographic publications (books). PubID parses both the legacy 10-digit form (with its check digit) and the current 13-digit form (EAN-13, prefixed 978 or 979), validating the check digit on parse.

InternationalSyntax ISBN identifiers follow: ISBN[][: ]{digits} with hyphens optional. The 10-digit form ends with a check character (0–9 or X); the 13-digit form (978/979 prefix) ends with a numeric check digit. At the flavor entry point (Pubid::Isbn.parse) a bare digit string parses without the "ISBN" token; global prefix routing requires the token. Website →
2
Doc Types
4
Components
1
Relations
0
Stages

Document Types 2

ISBN-10 (legacy)

ISBN▼

ISBN-13

ISBN▼

Components 4

Structured elements that make up a ISBN identifier:

Scheme
Enumeration

The "ISBN" token, optionally followed by a colon

ISBNISBN:
Optional for a bare 13-digit string
e.g.ISBN
Group
String

The registration group (language area / country)

0, 1 (English); 3 (German); 978-… prefixes carry it after the Bookland prefix
e.g.978-3
Registrant / Publication
String

The publisher and title allocations

Variable width; hyphenation is optional and preserved
e.g.16-148410
Check character
String

The final check digit or letter

0–9 or X for ISBN-10; 0–9 for ISBN-13. Validated on parse
e.g.0

PubID Algebra 1

Relationships between ISBN identifiers:

RelationDescriptionSyntaxExample
Bare formA bare digit string parses as an ISBN (13 digits → ISBN-13){13 digits}9783161484100