From Schema Bib Extend Community Group

Identifier Proposal

Status: Draft
Author: Karen Coyle


There are numerous identifiers that are used in bibliographic data that are not in a URI format. These include agency document identifiers (government and international agencies), identifiers used for non-book publishing (sound recordings and sheet music). The BookType has an isbn property but it would not be practical to create a separate property for each possible identifier. However, these string identifiers may not be unique nor useful without some contextual information that names the source or issuing agency.

It is proposed to define a new Identifier Type to describe the identifier with the minimum elements needed to make the identifier unique within its context by including information about the source or context.


1. Add one new Type:

Identifier, inherited from Intangible.

Definition: "An intangible item that describes a standard identifier"

Properties from Identifier
name Text The value of the identifier.
issuedBy The issuing organization/authority.


Les Miserables. (Selections from the Movie). By Claude-Michel Schonberg, Alain Boublil, and Herbert Kretzmer. For Piano/Vocal. Vocal Selections. Softcover. 88 pages. Published by Hal Leonard (HL.114335)

Note: using schema/Book because there is not yet a schema for written music, only musical recordings

N3 example

    @prefix schema: <> .

	[] a schema:Book;
    schema:author "Claude-Michel Schonberg, Alain Boublil, and Herbert   Kretzmer.";
    schema:bookFormat schema:Paperback;
    schema:description "For Piano/Vocal. Vocal Selections. ";
    schema:identifier [ a schema:Identifier;
            schema:issuedBy "Hal Leonard";
            schema:name "HL.114335" ];
    schema:name "Les Miserables. (Selections from the Movie).";
    schema:numberOfPages " 88 pages.".  

RDFa markup example

<div vocab="" typeof="Book">
   <span property="name">Les Miserables. (Selections from the Movie).</span>
         by <span property="author" >Claude-Michel Schonberg, Alain Boublil, and Herbert Kretzmer.</span> 
    <span property="description">For Piano/Vocal. Vocal Selections. </span> 
    <a property="bookFormat" href="">Softcover</a>. 
    <span property="numberOfPages"> 88 pages.</span>
    <span property="identifier" typeof="Identifier"><span property="issuedBy">Hal Leonard</span>,
    (<span property="name">HL.114335</span>)</span>

Microdata markup example

<div itemscope itemtype="">
   <span itemprop="name">Les Miserables. (Selections from the Movie).</span>
         by <span itemprop="author" >Claude-Michel Schonberg, Alain Boublil, and Herbert Kretzmer.</span> 
    <span property="description">For Piano/Vocal. Vocal Selections. </span> 
    <link itemprop="bookFormat" href="">Softcover</a>. 
    <span itemprop="numberOfPages"> 88 pages.</span>
    <div itemprop="identifier" itemscope=""><span itemprop="issuedBy">Hal Leonard</span>,
    (<span itemprop="name">HL.114335</span>)</div>