Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Formats Over Time: Exploring UK Web History

Andy Jackson
October 04, 2012

Formats Over Time: Exploring UK Web History

Andy Jackson

October 04, 2012
Tweet

More Decks by Andy Jackson

Other Decks in Research

Transcript

  1. Formats over Time Exploring UK Web History Andrew Jackson UK

    Web Archive, The British Library iPres 2012 | 04-10-2012 | Toronto
  2. Rothenberg & Rosenthal On Format Obsolescence   Jeff Rothenberg:  

    “Digital Information Lasts Forever – Or Five Years, Whichever Comes First.” (1997)   “…still apt…” (2012)   David Rosenthal:   “when challenged, proponents of [format migration strategies] have failed to identify even one format in wide use when Rothenberg [made that assertion] that has gone obsolete in the intervening decade and a half.” (2010)   That network effects inhibit obsolescence   Where is the evidence?
  3. UK Web Domain Dataset (1994-2010)   UK Web Domain Dataset

    (1994-2010)   From the Internet Archive   Millions of websites   > 2.5 billion resources   > 400,000 ARC/WARC files   > 35TB   Execution at Scale   Stored on HDFS   Map-Reduce
  4. Identification Tools   DROID   Well-known in digital preservation community

      Format version level identification   Minor problem concerning file handles   Only binary signature part (DROID-B) could be embedded   Apache Tika   Widely used identification and data extraction tool   Identifies many formats at the MIME type level   Easy to embed and extend   Added ability to extract e.g. software identifiers   Minor bug concerning identification buffer size
  5. A Common Language For Format Identifiers   Comparison and combination

    requires a common model   Map PRONOM IDs to extended MIME Types   fmt/18 becomes application/pdf; version=1.4   Allows easy comparison at sub-type level   Can easily extend to cover other properties:   text/plain; charset=UTF-8   application/pdf; software=“Adobe Acrobat 6.0”   Also extended Tika to output details from PDFs
  6. Format Profile Dataset   Server, Tika & DROID-B format profiles,

    over time: image/png image/png image/png; version=1.0 2004 102 ! application/pdf !
 application/pdf; version=1.2; software="Acrobat Distiller 4.0 for Windows"; 
 source="Adobe PageMaker 6.0" !
 application/pdf; version=1.2 !2004 !1   CC0 – free to download and reuse   http://data.webarchive.org.uk/opendata/ukwa.ds.2/fmt/   Please cite us and/or let us know if you use it   Source code of all tools and modifications also available   https://github.com/openplanets/nanite
  7. Coverage & Depth 0%# 1%# 10%# 100%# 1996# 1997# 1998#

    1999# 2000# 2001# 2002# 2003# 2004# 2005# 2006# 2007# 2008# 2009# 2010# Percentage)of)resources) uniden0fied) Year) DROID1B#v.59# Apache#Tika#1.1# No format-version-level information from Apache Tika.
  8. Inconsistencies   Gaps   37 formats spotted by DROID-B but

    not Tika   Notably includes earlier Office formats   129 formats spotted by Tika but not DROID-B   But at least 20 are due to not using the full DROID   Conflicts   Failed MIME type mapping, e.g. PDF 1.7 (since fixed)   ‘Soft’ signatures – e.g. PICT matching 3M JPG (gone)   DROID strictness – 9M GIF, 4M JPG, 1.3M PDF…   Both tools bad at non-HTML/XML text formats   CSS, scripting languages like JS, CSV, TSV, etc.
  9. Image Formats Over Time 0.00001%% 0.00010%% 0.00100%% 0.01000%% 0.10000%% 1.00000%%

    10.00000%% 100.00000%% 1996% 1997% 1998% 1999% 2000% 2001% 2002% 2003% 2004% 2005% 2006% 2007% 2008% 2009% 2010% Percentage)of)crawl) Year) JPEG% GIF% PNG% ICON% XBM% TIFF%
  10. HTML Versions Over Time HTML%2.0% HTML%3.2% HTML%4.0% HTML%4.01% XHTML%1.0% 0%%

    10%% 20%% 30%% 40%% 50%% 60%% 70%% 80%% 90%% 100%% 1996% 1997% 1998% 1999% 2000% 2001% 2002% 2003% 2004% 2005% 2006% 2007% 2008% 2009% 2010% Percentage)of)HTML)Resources) Year)
  11. PDF Versions Over Time 1.0$ 1.1$ 1.2$ 1.3$ 1.4$ 1.5$

    1.6$ 0%$ 10%$ 20%$ 30%$ 40%$ 50%$ 60%$ 70%$ 80%$ 90%$ 100%$ 1996$ 1997$ 1998$ 1999$ 2000$ 2001$ 2002$ 2003$ 2004$ 2005$ 2006$ 2007$ 2008$ 2009$ 2010$ Percentage)of)PDF)Resources) Year)
  12. Format Usage Versus Time 1" 10" 100" 1,000" 10,000" 100,000"

    1,000,000" 10,000,000" 100,000,000" 1,000,000,000" 10,000,000,000" 0" 2" 4" 6" 8" 10" 12" 14" 16" 18" Number'of'Resources'in'Archive' Timespan'[Years]'
  13. PDF Software Over Time Acrobat(Dis,ller( Acrobat( PDFWriter( Acrobat( 0%( 10%(

    20%( 30%( 40%( 50%( 60%( 70%( 80%( 90%( 100%( 1996( 1997( 1998( 1999( 2000( 2001( 2002( 2003( 2004( 2005( 2006( 2007( 2008( 2009( 2010( Percentage)of)PDF)Resources) Year) Over 2100 Distinct PDF Software IDs
  14. JPEG Hardware Over Time DS5$ CYBERSHOT$ E990$ MX1700$ NIKON$D40$ 0%$

    10%$ 20%$ 30%$ 40%$ 50%$ 60%$ 70%$ 80%$ 90%$ 100%$ 1994$ 1995$ 1996$ 1997$ 1998$ 1999$ 2000$ 2001$ 2002$ 2003$ 2004$ 2005$ 2006$ 2007$ 2008$ 2009$ 2010$ Percentage)of)Harware)IDs) Year) Over 2100 Distinct JPEG Hardware IDs
  15. Summary   Format obsolescence is complex   Network effects do

    appear to stabilize formats   But once popular formats are fading nevertheless   More sophisticated approach required   Please re-use our data, or ask for more   Firmer conclusions need:   Richer, more detailed results   From a wider range of corpora   This approach only gives creator information   A different approach will be needed to understand resource consumption (e.g. PPT 4, RealAudio 1)