Serialization of Types for Transfer Over HTTP

Boolean

When the response is simply a boolean True or False, the response returned is in one of two forms:

1. For cases where false is a valid response: a single character “1” if True, or “0” if False
2. For cases where false coincides with a DataONE exception: an arbitrary body if True (ignored by caller), and an error-indicating HTTP status code and serialized error object if False.

ObjectList

JSON

{
  'start': <integer>,
  'count': <integer>,
  'total': <integer>,
  'objectInfo':
  [
    {
      'identifier':<IdentifierType>,
      'objectFormat':<ObjectFormatType>,
      'checksum':
      {
        'algorithm':<checkSum Algorithm Type>,
        'value':<SHA1 hash of object>
      },
      'dateSysMetadataModified':<DateTime>,
      'size':<integer>
    },
    ...
  ]
}

CSV

#<start>,<count>,<total>
identifier,objectFormat,algorithm,checksum,dateSysMetadataModified,size
"<identifier>","<object class>","<SHA-1 | SHA-224 | MD5 | ...>","<SHA1 hash of object>","<date time last modified>",<byte size of object>

XML

<d1:listObjects xmlns:d1="http://dataone.org/service/types/ListObjects/0.1"
  xmlns:common="http://dataone.org/service/types/common/0.1"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  count="_integer_"
  start="_integer_"
  total="_integer_">
  <objectInfo>
    <identifier>_identifier_</identifier>
    <objectFormat>_object class_</objectFormat>
    <checksum algorithm='SHA-1 | SHA-224 | MD5 | ...'>_hash of object_</checksum>
    <dateSysMetadataModified>_date time last modified_</dateSysMetadataModified>
    <size>_byte size of object_</size>
  </objectInfo>
  ...
</d1:listObjects

HTML

Todo

Define ObjectList rendering in HTML

DescribeResponse

Returned in response to MN_crud.describe() which is called using the HTTP HEAD verb. As such, the response is entirely in the HTTP headers (no body).

Content-Length:SystemMetadata.size Last-Modified:<dateSysMetadataModified> DataONE-ObjectFormat:  <objectFormat> DataONE-Checksum:  <checksumAlgorithm>,<checksum>

Identifier

Returned as a simple string.

SystemMetadata

Currently returned only in the XML form.

ObjectLocationList

JSON

{
 'identifier':'1234',
 'locations': [
   ['mn1.dataone.org/mn', 'http://mn1.dataone.org/mn/object?id=1234'],
   ['mn2.dataone.org/some_base/mn', 'http://mn2.dataone.org/some_base/mn/object?id=1234'],
   ['cn.dataone.org/cn', 'http://cn.dataone.org/cn/object?id=1234'] ]
}

CSV

#1234
node,url
'mn1.dataone.org/mn','http://mn1.dataone.org/mn/object?id=1234'
'mn2.dataone.org/some_base/mn','http://mn2.dataone.org/some_base/mn/object?id=1234'
'cn.dataone.org/cn','http://cn.dataone.org/cn/object?id=1234'

XML

<locations identifier='1234'>
  <location node='mn1.dataone.org/mn' href='http://mn1.dataone.org/mn/object?id=1234' />
  <location node='mn2.dataone.org/some_base/mn' href='http://mn1.dataone.org/some_base/mn/object?id=1234' />
  <location node='cn.dataone.org/cn' href='http://cn.dataone.org/cn/object?id=1234' />
</locations>

HTML

...
<ol identifier='1234'>
  <a href='http://mn1.dataone.org/mn/object?id=1234'>mn1.dataone.org/mn</a>
  <a href='http://mn2.dataone.org/some_base/mn/object?id=1234'>mn1.dataone.org/some_base/mn</a>
  <a href='http://cn.dataone.org/cn/object?id=1234'>cn.dataone.org/cn</a>
</ol>
...