Document (#36457)

Author

Becker, C.
Rauber, A.

Title

Decision criteria in digital preservation : what to measure and how

Source

Journal of the American Society for Information Science and Technology. 62(2011) no.6, S.1009-1028

Year

2011

Abstract

The enormous amount of valuable information that is produced today and needs to be made available over the long-term has led to increased efforts in scalable, automated solutions for long-term digital preservation. The mission of preservation planning is to define the optimal actions to ensure future access to digital content and react to changes that require adjustments in repository operations. Considerable effort has been spent in the past on defining, implementing, and validating a framework and system for preservation planning. This article sheds light on the actual decision criteria and influence factors to be considered when choosing digital preservation actions. It is based on an extensive evaluation of case studies on preservation planning for a range of different types of objects with partners from different institutional backgrounds. We categorize decision criteria from a number of real-world decision-making instances in a taxonomy. We show that a majority of the criteria can be evaluated by applying automated measurements under realistic conditions, and demonstrate that controlled experimentation and automated measurements can be used to substantially improve repeatability of decisions and reduce the effort needed to evaluate preservation components. The presented measurement framework enables scalable preservation and monitoring and supports trust in preservation decisions because extensive evidence is produced in a reproducible, automated way and documented as the basis of decision making in a standardized form.

Similar documents (author)

1. Rauber, A.: Digital preservation in data-driven science : on the importance of process capture, preservation and validation (2012) 2.63

   2.625062 = sum of:
     2.625062 = product of:
       5.250124 = sum of:
         5.250124 = weight(author_txt:rauber in 1469) [ClassicSimilarity], result of:
           5.250124 = score(doc=1469,freq=1.0), product of:
             0.861068 = queryWeight, product of:
               1.3013005 = boost
               9.755557 = idf(docFreq=6, maxDocs=44421)
               0.067827806 = queryNorm
             6.0972233 = fieldWeight in 1469, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.755557 = idf(docFreq=6, maxDocs=44421)
               0.625 = fieldNorm(doc=1469)
       0.5 = coord(1/2)
   

2. Rauch, C.; Rauber, A.: Anwendung der Nutzwertanalyse zur Bewertung von Strategien zur langfristigen Erhaltung digitaler Objekte (2005) 2.10

   2.1000495 = sum of:
     2.1000495 = product of:
       4.200099 = sum of:
         4.200099 = weight(author_txt:rauber in 4859) [ClassicSimilarity], result of:
           4.200099 = score(doc=4859,freq=1.0), product of:
             0.861068 = queryWeight, product of:
               1.3013005 = boost
               9.755557 = idf(docFreq=6, maxDocs=44421)
               0.067827806 = queryNorm
             4.8777785 = fieldWeight in 4859, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.755557 = idf(docFreq=6, maxDocs=44421)
               0.5 = fieldNorm(doc=4859)
       0.5 = coord(1/2)
   

3. Rauber, K.; Nilges, A.: Was hieß noch mal schnell "Unterbegriff" auf Englisch? : Finden Sie die Antwort im Glossary to Terms of Information Literacy (2011) 2.10

   2.1000495 = sum of:
     2.1000495 = product of:
       4.200099 = sum of:
         4.200099 = weight(author_txt:rauber in 518) [ClassicSimilarity], result of:
           4.200099 = score(doc=518,freq=1.0), product of:
             0.861068 = queryWeight, product of:
               1.3013005 = boost
               9.755557 = idf(docFreq=6, maxDocs=44421)
               0.067827806 = queryNorm
             4.8777785 = fieldWeight in 518, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.755557 = idf(docFreq=6, maxDocs=44421)
               0.5 = fieldNorm(doc=518)
       0.5 = coord(1/2)
   

4. Bashir, S.; Rauber, A.: On the relationship between query characteristics and IR functions retrieval bias (2011) 2.10

   2.1000495 = sum of:
     2.1000495 = product of:
       4.200099 = sum of:
         4.200099 = weight(author_txt:rauber in 628) [ClassicSimilarity], result of:
           4.200099 = score(doc=628,freq=1.0), product of:
             0.861068 = queryWeight, product of:
               1.3013005 = boost
               9.755557 = idf(docFreq=6, maxDocs=44421)
               0.067827806 = queryNorm
             4.8777785 = fieldWeight in 628, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               9.755557 = idf(docFreq=6, maxDocs=44421)
               0.5 = fieldNorm(doc=628)
       0.5 = coord(1/2)
   

5. Becker, J.: Zentrallager : Data Warehouse - zentrale Sammelstelle für Informationen (1997) 1.19

   1.1912605 = sum of:
     1.1912605 = product of:
       2.382521 = sum of:
         2.382521 = weight(author_txt:becker in 4479) [ClassicSimilarity], result of:
           2.382521 = score(doc=4479,freq=1.0), product of:
             0.5084898 = queryWeight, product of:
               7.496775 = idf(docFreq=66, maxDocs=44421)
               0.067827806 = queryNorm
             4.6854844 = fieldWeight in 4479, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               7.496775 = idf(docFreq=66, maxDocs=44421)
               0.625 = fieldNorm(doc=4479)
       0.5 = coord(1/2)
   

Similar documents (content)

1. Dobratz, S.; Neuroth, H.: nestor: Network of Expertise in long-term STOrage of digital Resources : a digital preservation initiative for Germany (2004) 0.27

   0.2661321 = sum of:
     0.2661321 = product of:
       0.8316628 = sum of:
         0.0041294233 = weight(abstract_txt:that in 2195) [ClassicSimilarity], result of:
           0.0041294233 = score(doc=2195,freq=2.0), product of:
             0.03950983 = queryWeight, product of:
               1.23802 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.013494546 = queryNorm
             0.10451636 = fieldWeight in 2195, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.03125 = fieldNorm(doc=2195)
         0.047121614 = weight(abstract_txt:term in 2195) [ClassicSimilarity], result of:
           0.047121614 = score(doc=2195,freq=15.0), product of:
             0.0812011 = queryWeight, product of:
               1.2549921 = boost
               4.794713 = idf(docFreq=998, maxDocs=44421)
               0.013494546 = queryNorm
             0.5803076 = fieldWeight in 2195, product of:
               3.8729835 = tf(freq=15.0), with freq of:
                 15.0 = termFreq=15.0
               4.794713 = idf(docFreq=998, maxDocs=44421)
               0.03125 = fieldNorm(doc=2195)
         0.0615623 = weight(abstract_txt:long in 2195) [ClassicSimilarity], result of:
           0.0615623 = score(doc=2195,freq=15.0), product of:
             0.09704169 = queryWeight, product of:
               1.371953 = boost
               5.2415633 = idf(docFreq=638, maxDocs=44421)
               0.013494546 = queryNorm
             0.63439023 = fieldWeight in 2195, product of:
               3.8729835 = tf(freq=15.0), with freq of:
                 15.0 = termFreq=15.0
               5.2415633 = idf(docFreq=638, maxDocs=44421)
               0.03125 = fieldNorm(doc=2195)
         0.03592349 = weight(abstract_txt:effort in 2195) [ClassicSimilarity], result of:
           0.03592349 = score(doc=2195,freq=3.0), product of:
             0.11587528 = queryWeight, product of:
               1.4991858 = boost
               5.727658 = idf(docFreq=392, maxDocs=44421)
               0.013494546 = queryNorm
             0.31001857 = fieldWeight in 2195, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               5.727658 = idf(docFreq=392, maxDocs=44421)
               0.03125 = fieldNorm(doc=2195)
         0.0759021 = weight(abstract_txt:digital in 2195) [ClassicSimilarity], result of:
           0.0759021 = score(doc=2195,freq=18.0), product of:
             0.13229209 = queryWeight, product of:
               2.265385 = boost
               4.3274655 = idf(docFreq=1593, maxDocs=44421)
               0.013494546 = queryNorm
             0.57374626 = fieldWeight in 2195, product of:
               4.2426405 = tf(freq=18.0), with freq of:
                 18.0 = termFreq=18.0
               4.3274655 = idf(docFreq=1593, maxDocs=44421)
               0.03125 = fieldNorm(doc=2195)
         0.05351998 = weight(abstract_txt:planning in 2195) [ClassicSimilarity], result of:
           0.05351998 = score(doc=2195,freq=2.0), product of:
             0.198066 = queryWeight, product of:
               2.4005494 = boost
               6.114219 = idf(docFreq=266, maxDocs=44421)
               0.013494546 = queryNorm
             0.27021286 = fieldWeight in 2195, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               6.114219 = idf(docFreq=266, maxDocs=44421)
               0.03125 = fieldNorm(doc=2195)
         0.05376904 = weight(abstract_txt:criteria in 2195) [ClassicSimilarity], result of:
           0.05376904 = score(doc=2195,freq=2.0), product of:
             0.21867563 = queryWeight, product of:
               2.9125626 = boost
               5.5637407 = idf(docFreq=462, maxDocs=44421)
               0.013494546 = queryNorm
             0.24588493 = fieldWeight in 2195, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               5.5637407 = idf(docFreq=462, maxDocs=44421)
               0.03125 = fieldNorm(doc=2195)
         0.49973485 = weight(abstract_txt:preservation in 2195) [ClassicSimilarity], result of:
           0.49973485 = score(doc=2195,freq=14.0), product of:
             0.6621659 = queryWeight, product of:
               7.6023827 = boost
               6.4544435 = idf(docFreq=189, maxDocs=44421)
               0.013494546 = queryNorm
             0.7546974 = fieldWeight in 2195, product of:
               3.7416575 = tf(freq=14.0), with freq of:
                 14.0 = termFreq=14.0
               6.4544435 = idf(docFreq=189, maxDocs=44421)
               0.03125 = fieldNorm(doc=2195)
       0.32 = coord(8/25)
   

2. Liu, H.; Zhang, D.R.; Zhou, Q.S.; Li, B.: explore the interests and tensions of stakeholders in preservation actions : For perpetuating social media collective memory proactively and inclusively (2024) 0.23

   0.22976302 = sum of:
     0.22976302 = product of:
       0.9573459 = sum of:
         0.007299858 = weight(abstract_txt:that in 2291) [ClassicSimilarity], result of:
           0.007299858 = score(doc=2291,freq=1.0), product of:
             0.03950983 = queryWeight, product of:
               1.23802 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.013494546 = queryNorm
             0.18476056 = fieldWeight in 2291, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.078125 = fieldNorm(doc=2291)
         0.03041687 = weight(abstract_txt:term in 2291) [ClassicSimilarity], result of:
           0.03041687 = score(doc=2291,freq=1.0), product of:
             0.0812011 = queryWeight, product of:
               1.2549921 = boost
               4.794713 = idf(docFreq=998, maxDocs=44421)
               0.013494546 = queryNorm
             0.37458694 = fieldWeight in 2291, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.794713 = idf(docFreq=998, maxDocs=44421)
               0.078125 = fieldNorm(doc=2291)
         0.039738294 = weight(abstract_txt:long in 2291) [ClassicSimilarity], result of:
           0.039738294 = score(doc=2291,freq=1.0), product of:
             0.09704169 = queryWeight, product of:
               1.371953 = boost
               5.2415633 = idf(docFreq=638, maxDocs=44421)
               0.013494546 = queryNorm
             0.40949714 = fieldWeight in 2291, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.2415633 = idf(docFreq=638, maxDocs=44421)
               0.078125 = fieldNorm(doc=2291)
         0.05365668 = weight(abstract_txt:decisions in 2291) [ClassicSimilarity], result of:
           0.05365668 = score(doc=2291,freq=1.0), product of:
             0.11854996 = queryWeight, product of:
               1.5163895 = boost
               5.7933846 = idf(docFreq=367, maxDocs=44421)
               0.013494546 = queryNorm
             0.45260817 = fieldWeight in 2291, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.7933846 = idf(docFreq=367, maxDocs=44421)
               0.078125 = fieldNorm(doc=2291)
         0.07961248 = weight(abstract_txt:actions in 2291) [ClassicSimilarity], result of:
           0.07961248 = score(doc=2291,freq=1.0), product of:
             0.15421961 = queryWeight, product of:
               1.729537 = boost
               6.6077175 = idf(docFreq=162, maxDocs=44421)
               0.013494546 = queryNorm
             0.51622796 = fieldWeight in 2291, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.6077175 = idf(docFreq=162, maxDocs=44421)
               0.078125 = fieldNorm(doc=2291)
         0.7466217 = weight(abstract_txt:preservation in 2291) [ClassicSimilarity], result of:
           0.7466217 = score(doc=2291,freq=5.0), product of:
             0.6621659 = queryWeight, product of:
               7.6023827 = boost
               6.4544435 = idf(docFreq=189, maxDocs=44421)
               0.013494546 = queryNorm
             1.1275449 = fieldWeight in 2291, product of:
               2.236068 = tf(freq=5.0), with freq of:
                 5.0 = termFreq=5.0
               6.4544435 = idf(docFreq=189, maxDocs=44421)
               0.078125 = fieldNorm(doc=2291)
       0.24 = coord(6/25)
   

3. Williamson, A.: Strategies for managing digital content formats (2005) 0.23

   0.22502324 = sum of:
     0.22502324 = product of:
       0.80365443 = sum of:
         0.007299858 = weight(abstract_txt:that in 5745) [ClassicSimilarity], result of:
           0.007299858 = score(doc=5745,freq=1.0), product of:
             0.03950983 = queryWeight, product of:
               1.23802 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.013494546 = queryNorm
             0.18476056 = fieldWeight in 5745, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.078125 = fieldNorm(doc=5745)
         0.06083374 = weight(abstract_txt:term in 5745) [ClassicSimilarity], result of:
           0.06083374 = score(doc=5745,freq=4.0), product of:
             0.0812011 = queryWeight, product of:
               1.2549921 = boost
               4.794713 = idf(docFreq=998, maxDocs=44421)
               0.013494546 = queryNorm
             0.7491739 = fieldWeight in 5745, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               4.794713 = idf(docFreq=998, maxDocs=44421)
               0.078125 = fieldNorm(doc=5745)
         0.07947659 = weight(abstract_txt:long in 5745) [ClassicSimilarity], result of:
           0.07947659 = score(doc=5745,freq=4.0), product of:
             0.09704169 = queryWeight, product of:
               1.371953 = boost
               5.2415633 = idf(docFreq=638, maxDocs=44421)
               0.013494546 = queryNorm
             0.8189943 = fieldWeight in 5745, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               5.2415633 = idf(docFreq=638, maxDocs=44421)
               0.078125 = fieldNorm(doc=5745)
         0.047033917 = weight(abstract_txt:produced in 5745) [ClassicSimilarity], result of:
           0.047033917 = score(doc=5745,freq=1.0), product of:
             0.10858245 = queryWeight, product of:
               1.4512421 = boost
               5.5444884 = idf(docFreq=471, maxDocs=44421)
               0.013494546 = queryNorm
             0.43316317 = fieldWeight in 5745, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.5444884 = idf(docFreq=471, maxDocs=44421)
               0.078125 = fieldNorm(doc=5745)
         0.059338085 = weight(abstract_txt:extensive in 5745) [ClassicSimilarity], result of:
           0.059338085 = score(doc=5745,freq=1.0), product of:
             0.12677722 = queryWeight, product of:
               1.568125 = boost
               5.9910407 = idf(docFreq=301, maxDocs=44421)
               0.013494546 = queryNorm
             0.46805006 = fieldWeight in 5745, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.9910407 = idf(docFreq=301, maxDocs=44421)
               0.078125 = fieldNorm(doc=5745)
         0.077467255 = weight(abstract_txt:digital in 5745) [ClassicSimilarity], result of:
           0.077467255 = score(doc=5745,freq=3.0), product of:
             0.13229209 = queryWeight, product of:
               2.265385 = boost
               4.3274655 = idf(docFreq=1593, maxDocs=44421)
               0.013494546 = queryNorm
             0.58557737 = fieldWeight in 5745, product of:
               1.7320508 = tf(freq=3.0), with freq of:
                 3.0 = termFreq=3.0
               4.3274655 = idf(docFreq=1593, maxDocs=44421)
               0.078125 = fieldNorm(doc=5745)
         0.472205 = weight(abstract_txt:preservation in 5745) [ClassicSimilarity], result of:
           0.472205 = score(doc=5745,freq=2.0), product of:
             0.6621659 = queryWeight, product of:
               7.6023827 = boost
               6.4544435 = idf(docFreq=189, maxDocs=44421)
               0.013494546 = queryNorm
             0.71312195 = fieldWeight in 5745, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               6.4544435 = idf(docFreq=189, maxDocs=44421)
               0.078125 = fieldNorm(doc=5745)
       0.28 = coord(7/25)
   

4. Lupovici, C.: Web crawling : the Bibliothèque Nationale de France experience (2005) 0.21

   0.20630315 = sum of:
     0.20630315 = product of:
       0.8595965 = sum of:
         0.03625904 = weight(abstract_txt:framework in 5352) [ClassicSimilarity], result of:
           0.03625904 = score(doc=5352,freq=1.0), product of:
             0.07294761 = queryWeight, product of:
               1.1895031 = boost
               4.5445113 = idf(docFreq=1282, maxDocs=44421)
               0.013494546 = queryNorm
             0.49705592 = fieldWeight in 5352, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.5445113 = idf(docFreq=1282, maxDocs=44421)
               0.109375 = fieldNorm(doc=5352)
         0.042583622 = weight(abstract_txt:term in 5352) [ClassicSimilarity], result of:
           0.042583622 = score(doc=5352,freq=1.0), product of:
             0.0812011 = queryWeight, product of:
               1.2549921 = boost
               4.794713 = idf(docFreq=998, maxDocs=44421)
               0.013494546 = queryNorm
             0.52442175 = fieldWeight in 5352, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.794713 = idf(docFreq=998, maxDocs=44421)
               0.109375 = fieldNorm(doc=5352)
         0.055633612 = weight(abstract_txt:long in 5352) [ClassicSimilarity], result of:
           0.055633612 = score(doc=5352,freq=1.0), product of:
             0.09704169 = queryWeight, product of:
               1.371953 = boost
               5.2415633 = idf(docFreq=638, maxDocs=44421)
               0.013494546 = queryNorm
             0.573296 = fieldWeight in 5352, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.2415633 = idf(docFreq=638, maxDocs=44421)
               0.109375 = fieldNorm(doc=5352)
         0.088552445 = weight(abstract_txt:digital in 5352) [ClassicSimilarity], result of:
           0.088552445 = score(doc=5352,freq=2.0), product of:
             0.13229209 = queryWeight, product of:
               2.265385 = boost
               4.3274655 = idf(docFreq=1593, maxDocs=44421)
               0.013494546 = queryNorm
             0.66937065 = fieldWeight in 5352, product of:
               1.4142135 = tf(freq=2.0), with freq of:
                 2.0 = termFreq=2.0
               4.3274655 = idf(docFreq=1593, maxDocs=44421)
               0.109375 = fieldNorm(doc=5352)
         0.1691086 = weight(abstract_txt:decision in 5352) [ClassicSimilarity], result of:
           0.1691086 = score(doc=5352,freq=1.0), product of:
             0.27636984 = queryWeight, product of:
               3.6607947 = boost
               5.5944448 = idf(docFreq=448, maxDocs=44421)
               0.013494546 = queryNorm
             0.6118924 = fieldWeight in 5352, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               5.5944448 = idf(docFreq=448, maxDocs=44421)
               0.109375 = fieldNorm(doc=5352)
         0.46745914 = weight(abstract_txt:preservation in 5352) [ClassicSimilarity], result of:
           0.46745914 = score(doc=5352,freq=1.0), product of:
             0.6621659 = queryWeight, product of:
               7.6023827 = boost
               6.4544435 = idf(docFreq=189, maxDocs=44421)
               0.013494546 = queryNorm
             0.70595473 = fieldWeight in 5352, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               6.4544435 = idf(docFreq=189, maxDocs=44421)
               0.109375 = fieldNorm(doc=5352)
       0.24 = coord(6/25)
   

5. Lor, P.J.; Britz, J.J.: ¬An ethical perspective on political-economic issues in the long-term preservation of digital heritage (2012) 0.16

   0.15704508 = sum of:
     0.15704508 = product of:
       0.7852254 = sum of:
         0.020719452 = weight(abstract_txt:framework in 1487) [ClassicSimilarity], result of:
           0.020719452 = score(doc=1487,freq=1.0), product of:
             0.07294761 = queryWeight, product of:
               1.1895031 = boost
               4.5445113 = idf(docFreq=1282, maxDocs=44421)
               0.013494546 = queryNorm
             0.28403196 = fieldWeight in 1487, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.5445113 = idf(docFreq=1282, maxDocs=44421)
               0.0625 = fieldNorm(doc=1487)
         0.014304743 = weight(abstract_txt:that in 1487) [ClassicSimilarity], result of:
           0.014304743 = score(doc=1487,freq=6.0), product of:
             0.03950983 = queryWeight, product of:
               1.23802 = boost
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.013494546 = queryNorm
             0.3620553 = fieldWeight in 1487, product of:
               2.4494898 = tf(freq=6.0), with freq of:
                 6.0 = termFreq=6.0
               2.3649352 = idf(docFreq=11344, maxDocs=44421)
               0.0625 = fieldNorm(doc=1487)
         0.024333498 = weight(abstract_txt:term in 1487) [ClassicSimilarity], result of:
           0.024333498 = score(doc=1487,freq=1.0), product of:
             0.0812011 = queryWeight, product of:
               1.2549921 = boost
               4.794713 = idf(docFreq=998, maxDocs=44421)
               0.013494546 = queryNorm
             0.29966956 = fieldWeight in 1487, product of:
               1.0 = tf(freq=1.0), with freq of:
                 1.0 = termFreq=1.0
               4.794713 = idf(docFreq=998, maxDocs=44421)
               0.0625 = fieldNorm(doc=1487)
         0.07156118 = weight(abstract_txt:digital in 1487) [ClassicSimilarity], result of:
           0.07156118 = score(doc=1487,freq=4.0), product of:
             0.13229209 = queryWeight, product of:
               2.265385 = boost
               4.3274655 = idf(docFreq=1593, maxDocs=44421)
               0.013494546 = queryNorm
             0.5409332 = fieldWeight in 1487, product of:
               2.0 = tf(freq=4.0), with freq of:
                 4.0 = termFreq=4.0
               4.3274655 = idf(docFreq=1593, maxDocs=44421)
               0.0625 = fieldNorm(doc=1487)
         0.65430653 = weight(abstract_txt:preservation in 1487) [ClassicSimilarity], result of:
           0.65430653 = score(doc=1487,freq=6.0), product of:
             0.6621659 = queryWeight, product of:
               7.6023827 = boost
               6.4544435 = idf(docFreq=189, maxDocs=44421)
               0.013494546 = queryNorm
             0.98813087 = fieldWeight in 1487, product of:
               2.4494898 = tf(freq=6.0), with freq of:
                 6.0 = termFreq=6.0
               6.4544435 = idf(docFreq=189, maxDocs=44421)
               0.0625 = fieldNorm(doc=1487)
       0.2 = coord(5/25)