Metadata for Trove digitised works

In poking around to try and find a way of automating the download of OCR text from Trove's digitised books, I discovered that there's lots of useful metadata embedded in the page of a digitised work. Most of this metadata isn't available through the Trove API.

The works that I'm talking about are things like digitised books and journal issues that have an nla.obj in their url. For some examples, you can search in the book zone for records containing nla.obj.

As you can see from the code below, it's pretty easy to extract the data from the HTML of the web page – just one regular expression does the job.

In [22]:
import requests
import re
import json
from IPython.display import display

This is the url of the work we're going to extract metadata from. You could change this to any other nla.obj link.

In [13]:
trove_digitised_url = 'https://nla.gov.au/nla.obj-362059651/'

We just have to load the HTML page and then do a regex search for the JSON string. Then we turn the string back into a JSON object and display it.

Note the detailed data information on children – they include the individual pages of a work.

In [21]:
# Get the HTML page
response = requests.get(trove_digitised_url)
# Search for the JSON string using regex
try:
    work_data = re.search(r'var work = JSON\.parse\(JSON\.stringify\((\{.*\})', response.text).group(1)
except AttributeError:
    # Just in case it's not there...
    work_data = '{}'
    print('No data found!')
# Display the JSON
display(json.loads(work_data))
{'id': '36205965',
 'collection': 'nla.aus',
 'type': 'work',
 'form': 'Book',
 'subType': 'book',
 'bibLevel': 'Item',
 'bibId': '653766',
 'holdingNumber': 'JAFp BIO 92',
 'pid': 'nla.obj-362059651',
 'title': "Lord Robert Cecil's gold fields diary",
 'accessConditions': 'Unrestricted',
 'copyrightPolicy': 'Out of Copyright',
 'recordSource': 'Voyager',
 'digitalStatus': 'Captured',
 'startDate': '01 January 1945',
 'creator': 'Salisbury, Robert Cecil, marquess of, 1830-1903.',
 'extent': '32 p., [20] p. of plates : ill. ; 18 cm.',
 'publisherName': 'Melbourne University Press',
 'findingAidAvailable': 'No',
 'isOriginalCopyAvaliable': 'false',
 'marcData': {'record': [{'leader': {'type': 'Bibliographic',
     'content': '01058cam a2200277 a 4500'},
    'datafield': [{'ind2': ' ',
      'ind1': 1,
      'subfield': [{'code': 'a', 'content': 2617933},
       {'code': 'z', 'content': 9324621}],
      'tag': '019'},
     {'ind2': ' ',
      'ind1': ' ',
      'subfield': {'code': 9, 'content': '(AuCNLDY)577939'},
      'tag': '035'},
     {'ind2': ' ',
      'ind1': ' ',
      'subfield': {'code': 'a', 'content': 653766},
      'tag': '035'},
     {'ind2': ' ',
      'ind1': ' ',
      'subfield': [{'code': 'a', 'content': 'NNCU:A'},
       {'code': 'b', 'content': 'eng'},
       {'code': 'c', 'content': 'NNCU:A'},
       {'code': 'd', 'content': 'AUC:LSM'}],
      'tag': '040'},
     {'ind2': ' ',
      'ind1': ' ',
      'subfield': {'code': 'a', 'content': 'anuc'},
      'tag': '042'},
     {'ind2': ' ',
      'ind1': ' ',
      'subfield': {'code': 'a', 'content': 'u-at-vi'},
      'tag': '043'},
     {'ind2': 4,
      'ind1': 0,
      'subfield': [{'code': 'a', 'content': '994.5/03'},
       {'code': 2, 'content': 19}],
      'tag': '082'},
     {'ind2': ' ',
      'ind1': 1,
      'subfield': [{'code': 'a', 'content': 'Salisbury, Robert Cecil,'},
       {'code': 'c', 'content': 'marquess of,'},
       {'code': 'd', 'content': '1830-1903.'}],
      'tag': 100},
     {'ind2': 0,
      'ind1': 1,
      'subfield': [{'code': 'a',
        'content': "Lord Robert Cecil's gold fields diary /"},
       {'code': 'c',
        'content': 'with introduction and notes by Sir Ernest Scott.'}],
      'tag': 245},
     {'ind2': ' ',
      'ind1': ' ',
      'subfield': {'code': 'a', 'content': '2nd ed.'},
      'tag': 250},
     {'ind2': ' ',
      'ind1': ' ',
      'subfield': [{'code': 'a', 'content': 'Carlton, Vic. :'},
       {'code': 'b', 'content': 'Melbourne University Press,'},
       {'code': 'c', 'content': '1945.'}],
      'tag': 260},
     {'ind2': ' ',
      'ind1': ' ',
      'subfield': [{'code': 'a', 'content': '32 p., [20] p. of plates :'},
       {'code': 'b', 'content': 'ill. ;'},
       {'code': 'c', 'content': '18 cm.'}],
      'tag': 300},
     {'ind2': ' ',
      'ind1': ' ',
      'subfield': [{'code': 'a', 'content': 'Also available online'},
       {'code': 'u', 'content': 'http://nla.gov.au/nla.obj-362059651'}],
      'tag': 530},
     {'ind2': 0,
      'ind1': 1,
      'subfield': [{'code': 'a', 'content': 'Salisbury, Robert Cecil,'},
       {'code': 'c', 'content': 'marquess of,'},
       {'code': 'd', 'content': '1830-1903.'}],
      'tag': 600},
     {'ind2': 0,
      'ind1': ' ',
      'subfield': [{'code': 'a', 'content': 'Gold mines and mining'},
       {'code': 'z', 'content': 'Victoria.'}],
      'tag': 650},
     {'ind2': 0,
      'ind1': ' ',
      'subfield': [{'code': 'a', 'content': 'Victoria'},
       {'code': 'x', 'content': 'Description and travel.'}],
      'tag': 651},
     {'ind2': ' ',
      'ind1': 1,
      'subfield': [{'code': 'a', 'content': 'Scott, Ernest,'},
       {'code': 'd', 'content': '1868-1939.'}],
      'tag': 700},
     {'ind2': 1,
      'ind1': 4,
      'subfield': [{'code': 'z',
        'content': 'National Library of Australia digitised item. JAFp BIO 92 copy'},
       {'code': 'u', 'content': 'http://nla.gov.au/nla.obj-362059651'}],
      'tag': 856}],
    'controlfield': [{'tag': '001', 'content': 653766},
     {'tag': '005', 'content': '20180919200840.0'},
     {'tag': '008', 'content': '830518s1945    vraa          000 0aeng d'}]},
   {'leader': {'type': 'Holdings', 'content': '00201nx  a22000974  4500'},
    'datafield': [{'ind2': ' ',
      'ind1': 1,
      'subfield': [{'code': 'b', 'content': 'AUSLP'},
       {'code': 'k', 'content': 'NLp'},
       {'code': 'h', 'content': 994.5},
       {'code': 'i', 'content': 'SAL'}],
      'tag': 852},
     {'ind2': 0,
      'ind1': ' ',
      'subfield': {'code': 'z', 'content': 'NL pbk'},
      'tag': 866},
     {'ind2': '',
      'ind1': '',
      'subfield': {'code': 'a', 'content': 'NLA'},
      'tag': 954}],
    'controlfield': [{'tag': '001', 'content': 4042315},
     {'tag': '004', 'content': 653766},
     {'tag': '005', 'content': '20051219130415.0'},
     {'tag': '008', 'content': '0512194u    8   1001uu   0901128'}]},
   {'leader': {'type': 'Holdings', 'content': '00198cx  a22000973  4500'},
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      'subfield': [{'code': 'b', 'content': 'AUSP'},
       {'code': 'k', 'content': 'Np'},
       {'code': 'h', 'content': 994.5},
       {'code': 'i', 'content': 'SAL'}],
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     {'ind2': 0,
      'ind1': ' ',
      'subfield': {'code': 'z', 'content': 'N pbk'},
      'tag': 866},
     {'ind2': '',
      'ind1': '',
      'subfield': {'code': 'a', 'content': 'NLA'},
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    'controlfield': [{'tag': '001', 'content': 2912182},
     {'tag': '004', 'content': 653766},
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      'subfield': [{'code': 'b', 'content': 'PET'},
       {'code': 'h', 'content': 'JAFp BIO 92'}],
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     {'ind2': '',
      'ind1': '',
      'subfield': {'code': 'a', 'content': 'NLA'},
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    'controlfield': [{'tag': '001', 'content': 2912183},
     {'tag': '004', 'content': 653766},
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   {'leader': {'type': 'Holdings', 'content': '00197cx  a22000973  4500'},
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       {'code': 'h', 'content': 'JAFp GEN SAL'}],
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     {'ind2': 0,
      'ind1': ' ',
      'subfield': {'code': 'z', 'content': 'FC copy'},
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     {'ind2': '',
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 'children': {'page': [{'id': '36205990',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362059904',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551350,
      'filename': None,
      'filesize': 357765,
      'technicalmetadata': {'width': 1926, 'height': 2840}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 16436560}]},
   {'id': '36206003',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362060036',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551354,
      'filename': None,
      'filesize': 325233,
      'technicalmetadata': {'width': 1743, 'height': 2808}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 14709600}]},
   {'id': '36206017',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362060175',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551358,
      'filename': None,
      'filesize': 332757,
      'technicalmetadata': {'width': 1766, 'height': 2822}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 14976176}]},
   {'id': '36206030',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362060307',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551362,
      'filename': None,
      'filesize': 290972,
      'technicalmetadata': {'width': 1642, 'height': 2649}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 13074028}]},
   {'id': '36206043',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362060433',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551366,
      'filename': None,
      'filesize': 316353,
      'technicalmetadata': {'width': 1694, 'height': 2798}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 14244196}]},
   {'id': '36206056',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362060563',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551370,
      'filename': None,
      'filesize': 308812,
      'technicalmetadata': {'width': 1678, 'height': 2739}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 13813536}]},
   {'id': '36206069',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362060694',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551374,
      'filename': None,
      'filesize': 315081,
      'technicalmetadata': {'width': 1688, 'height': 2792}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 14165840}]},
   {'id': '36206082',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362060828',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551378,
      'filename': None,
      'filesize': 314714,
      'technicalmetadata': {'width': 1690, 'height': 2782}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 14129776}]},
   {'id': '36206095',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362060959',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551382,
      'filename': None,
      'filesize': 315411,
      'technicalmetadata': {'width': 1700, 'height': 2792}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 14266964}]},
   {'id': '36206108',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362061083',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551386,
      'filename': None,
      'filesize': 310531,
      'technicalmetadata': {'width': 1674, 'height': 2783}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 14004236}]},
   {'id': '36206121',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362061212',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551390,
      'filename': None,
      'filesize': 316813,
      'technicalmetadata': {'width': 1706, 'height': 2804}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 14378908}]},
   {'id': '36206134',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362061349',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551394,
      'filename': None,
      'filesize': 309855,
      'technicalmetadata': {'width': 1670, 'height': 2796}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 14036000}]},
   {'id': '36206147',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362061476',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551398,
      'filename': None,
      'filesize': 321690,
      'technicalmetadata': {'width': 1706, 'height': 2822}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 14469512}]},
   {'id': '36206160',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362061603',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551402,
      'filename': None,
      'filesize': 302721,
      'technicalmetadata': {'width': 1645, 'height': 2750}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 13599008}]},
   {'id': '36206173',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362061731',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551406,
      'filename': None,
      'filesize': 302730,
      'technicalmetadata': {'width': 1661, 'height': 2743}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 13696764}]},
   {'id': '36206186',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362061862',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551410,
      'filename': None,
      'filesize': 309234,
      'technicalmetadata': {'width': 1669, 'height': 2783}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 13962668}]},
   {'id': '36206199',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362061995',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
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      'filename': None,
      'filesize': 318131,
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     {'copyrole': 'm', 'access': 'false', 'filesize': 14369336}]},
   {'id': '36206212',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362062124',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551418,
      'filename': None,
      'filesize': 307502,
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   {'id': '36206225',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362062250',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
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      'filename': None,
      'filesize': 310439,
      'technicalmetadata': {'width': 1664, 'height': 2822}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 14114880}]},
   {'id': '36206238',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362062384',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551426,
      'filename': None,
      'filesize': 301196,
      'technicalmetadata': {'width': 1648, 'height': 2763}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 13687828}]},
   {'id': '36206251',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362062514',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551430,
      'filename': None,
      'filesize': 309281,
      'technicalmetadata': {'width': 1666, 'height': 2775}},
     {'copyrole': 'm', 'access': 'false', 'filesize': 13897256}]},
   {'id': '36206264',
    'subType': 'page',
    'title': "Lord Robert Cecil's gold fields diary",
    'bibId': '653766',
    'pid': 'nla.obj-362062649',
    'form': 'Book',
    'accessConditions': 'Unrestricted',
    'copyrightPolicy': 'Out of Copyright',
    'bibLevel': 'Part',
    'digitalStatus': 'Captured',
    'holdingNumber': 'JAFp BIO 92',
    'copies': [{'copyrole': 'access',
      'blobId': 11551434,
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In [ ]: