VEP-007: datalink-core#detached-header

[Baptiste Cecconi]

Dear colleagues, 

here is a proposed new term for datalink-core:
 
http://volute.g-vo.org/svn/trunk/projects/semantics/veps/VEP-007.txt

I copy the submitted content below for review in the list:

Vocabulary: http://www.ivoa.net/rdf/datalink-core
Author: Baptiste Cecconi <baptiste.cecconi at obspm.fr>
Date: 2021-06-09

New Term: #detached-header
Action: Addition
Label: Detached Header
Description: Machine-readable metadata for #this, which in general 
will be necessary for its scientific use.  Examples include FITS 
headers distributed without their data blocks or PDS label files. 

Relationships: rdfs:subPropertyOf(documentation)
Used-in: http://voparis-tap-maser.obspm.fr/voyager_pra/epn/dl/dlmeta?ID=VG1-J-PRA-3-RDR-LOWBAND-6SEC-V1.0%3APRA_I.TAB

Rationale:
In some archives (e.g., NASA/PDS), so-called PDS label files are 
associated to each product/document of the archive.  In the case of 
NASA/PDS data products, the label file contains the required metadata 
for decoding the content of #this.  It can be looked as a detached 
FITS header, stored separately as a plain text file, next to a data 
file consisting in a binary stream of bytes.  Clients would use the 
content type (MIME type) (e.g.: application/x-pds4-label+xml, or 
text/x-pds3-label) to enable the processing.



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