Edurep:Metadata/Object Identifier/en

Nederlands

English

The object identifier is used to uniquely identify the learning resource.

• not to be confused with the record identifier
• the object identifier is not intended to metadata the URL to the learning resource:
  • the URL to the learning resource may be used additionally as an object identifier, please note that the order of URL parameters does not determine the functionality of a URL, but it does determine its use as an object identifier
  • unlike the URL, the object identifier must not change if the physical location of the learning object changes.

The object identifier is also used to create links between entities in Edurep, specifically between a learning resource metadata record and a social metadata record.

Such a metadata link can only be made with a URI. RFC 2396 is used as the definition of a URI. Since an object identifier may appear multiple times, a URI definition may appear alongside other definitions. For example, a formal URN naming can be chosen when it is available.

NL LOM

Specification

(leading)

<!-- to enable linking, Urn ISBN notation is preferred -->
<lom>
  <general>
    <catalogentry> 
      <catalog>URI</catalog>
      <entry> 
        <langstring xml:lang="x-none">urn:isbn:0-395-36341-1<langstring>
      <entry>
    </catalogentry> 
    <catalogentry> 
      <catalog>ISBN</catalog>
      <entry> 
        <langstring xml:lang="x-none">0-395-36341-1<langstring>
      <entry>
    </catalogentry> 
  </general>
</lom>

If there is no formal URN scheme, a custom scheme can also be used in the URI. The homemade scheme may not be one of the known URI schemes .

<lom>
  <general>
    <catalogentry> 
      <catalog>URI</catalog>
      <entry> 
        <langstring xml:lang="x-none">lesidee:138<langstring>
      <entry>
    </catalogentry> 
    <catalogentry> 
      <catalog>LESIDEE.NL</catalog>
      <entry> 
        <langstring xml:lang="x-none">138<langstring>
      <entry>
    </catalogentry>
  </general>
</lom>

Schema.org

Specification (identifier)

(leading)

In schema.org, object identifiers are placed in the schema:identifier field. Furthermore, depending on the type of entity, a number of specific identifier fields are available, for example:

• schema:isbn for the Book type
• schema:gtin for the Product type

{
  "@context": {
    "schema": "https://schema.org/"
  },
  "schema:identifier": [
    "http://example.org/resource/1",
    "urn:isbn:978-1-56619-909-4"
  ],
  "schema:isbn": "978-1-56619-909-4"

}

SMO

In a metadata record of an SMO review, the object identifier of the learning material that is the subject of the review is placed in the hreview:info field. This value is used to create the link with the learning material metadata record.

<smd:smo xmlns:smd="http://xsd.kennisnet.nl/smd/1.0/" xmlns:hreview="http://xsd.kennisnet.nl/smd/hreview/1.0/">
  <hreview:hReview>
    <hreview:info>https://www.kennisnet.nl</hreview:info>
  </hreview:hReview>
</sdm:smo>

In the schema.org Review representation this is the schema:itemReviewed attribute.

{
  "@context": {
    "schema": "https://schema.org/"
  },
  "schema:review": {
    "@type": "schema:Review",
    "schema:itemReviewed": "https://www.kennisnet.nl"
  }
}