std-id-link-type Standard ID Link Type

Names the type of link that the <std-id> contains, for example, a DOI
OPTIONAL on element: <std-id>
Value Meaning
Text, numbers, or special characters The type of link that the <std-id> contains, for example, a DOI.
Restriction This is an optional attribute; there is no default.

Suggested usage

Best Practice: Although this attribute may take any text as values, the suggested values should be the following or similar:
doi
The standard identifier (<std-id>) is a Digital Object Identifier (DOI).
urn
The standard identifier (<std-id>) is a Uniform Resource Name (URN).
internal-pub-id
The standard identifier (<std-id>) is an internal publication identifier of a standards organization.
Tagged Sample

Three <std-id> all DOIs

...
<std
 ><std-ref>ISO 9001:2015</std-ref>
 <std-id-group>
  <std-id 
    std-id-type="dated" 
    std-id-link-type="doi" 
    originator="ISO">10.9999/ISO-9001:2015</std-id>
  <std-id 
    std-id-type="dated" 
    std-id-link-type="doi"
    std-relationship-type="std-adopted-from" 
    originator="EN">10.9998/EN-ISO-9001:2015</std-id>
  <std-id 
    std-id-type="dated" 
    std-id-link-type="doi"
    std-relationship-type="std-adopted-from"
    originator="BSI" >10.9998/BS-EN-ISO-9001:2015</std-id>
 </std-id-group></std>
...