The document discusses converting PDF documents to SVG format in order to build a searchable text archive from PDF files. It describes using a tool called pdf2svg to convert PDFs to SVG, and then working with the SVG XML structure to extract text elements, their positions and formatting for indexing and search. Code examples are provided for parsing the SVG XML to extract text snippets and their positions on the page.

1. How to make
Google Books
at home

2. in Perl

3. at home

4. not to beat Google

5. What do we have
in the internet
today?

9. Find a word

10. Find the words

11. Google

14. Show the page

15. Show the page
and highlight
the words

20. ... Russia ... ece yapc/coe ...

21. ... Russia ... ece yapc/coe ...
Pushkin?

22. ... Russia ... ece yapc/coe ...
YAPC?

23. ... Russia ... ece yapc/coe ...
XIX?

24. ... Russia ... ece yapc/coe ...
WTF?

26. ece yapc/coe

27. ece yapc/coe
все царское

28. все царское
ece yapc/coe

29. Amazon

32. Guess
the next screen

36. Text archive

41. Berlin

43. How to make it

44. PDF

45. PDF

46. (Black box)
PDF

47. WEB
PDF

48. Sample PDF
use.perl.org/~andy.sh/journal

49. Work with PDF?

50. No
Work with PDF?

51. SVG

52. SVG
Scalable vector graphics

53. SVG
Scalable vector graphics
http://www.w3.org/Graphics/SVG/

54. SVG is XML

55. SVG is XML
XML::LibXML

56. SVG is XML
XML::LibXML
XPath

57. SVG is XML
XML::LibXML
XPath
XSLT

58. PDF
http://www.pdftron.com/pdf2svg/
SVG

60. $ ./pdf2svg book.pdf book.svg

62. Structure

67. Geometry

68. <g>
</g>

69. <g>
<g>
</g>
</g>

70. <g>
<g>
</g>
<g>
</g>
</g>

71. <g>
<g>
<text>
</text>
</g>
<g>
</g>
</g>

72. <g>
<g>
<text>
</text>
<text>
</text>
</g>
<g>
</g>
</g>

73. <g>
<g>
<text>
<tspan>
</tspan>
</text>
<text>
</text>
</g>
<g>
</g>
</g>

74. <g>

75. <text>

76. <text
transform=...
>

77. <text
transform=
quot;matrix(
1 0 0 ‐1
10 584
)quot;
>

78. Page

79. Page
g

80. Page
g
text

81. Page
g
text + transform

83. <tspan>

84. Page
g
text + transform
tspan

85. my $transform = $node‐>findvalue('@transform');
if ($transform =~ /matrix/) {
my ($sx, $sy, $tx, $ty) = $transform =~ /matrix((‐?
d+(?:.d+)?) ‐?d(?:.d+)?+ ‐?d(?:.d+)?+ (‐?d+(?:.d
+)?) (‐?d+(?:.d+)?) (‐?d+(?:.d+)?))/;
print quot;($sx, $sy, $tx, $ty)quot;;
$pos{x} = $sx * $tx;
$pos{x} += $pos{pagew} if $sx < 0;
$pos{y} = $sy * $ty;
$pos{y} += $pos{pageh} if $sy < 0;
print quot; [$pos{x}, $pos{y}]quot;;
}

86. <tspan
x=quot;0,16.875,26.258,34.695,4
0.314,44.533,49.224,55.789,
60.008,64.699quot; y=quot;‐0quot;
class=quot;ps00 ps23quot;>What is
it</tspan>

87. <tspan
x=quot;0,16.875,26.258,34.695,4
0.314,44.533,49.224,55.789,
60.008,64.699quot; y=quot;‐0quot;
class=quot;ps00 ps23quot;>What is
it</tspan>

88. <tspan
x=quot;0,16.875,26.258,34.695,4
0.314,44.533,49.224,55.789,
60.008,64.699quot; y=quot;‐0quot;
class=quot;ps00 ps23quot;>What is
it</tspan>

89. <tspan
x=quot;0,16.875,26.258,34.695,4
0.314,44.533,49.224,55.789,
60.008,64.699quot; y=quot;‐0quot;
class=quot;ps00 ps23quot;>What is
it</tspan>

90. <tspan
x=quot;0,16.875,26.258,34.695,4
0.314,44.533,49.224,55.789,
60.008,64.699quot; y=quot;‐0quot;
class=quot;ps00 ps23quot;>What is
it</tspan>

91. <tspan
x=quot;0,16.875,26.258,34.695,4
0.314,44.533,49.224,55.789,
60.008,64.699quot; y=quot;‐0quot;
class=quot;ps00 ps23quot;>What is
it</tspan>

92. <tspan
x=quot;0,16.875,26.258,34.695,4
0.314,44.533,49.224,55.789,
60.008,64.699quot; y=quot;‐0quot;
class=quot;ps00 ps23quot;>What is
it</tspan>

93. YAPC

94. <tspan>YAPC</tspan>

95. Y APC

96. Y APC

97. <tspan>Y</tspan>
<tspan>APC</tspan>

98. Dictionary

99. mysql> select * from base where base like 'seek';
+‐‐‐‐‐‐‐‐+‐‐‐‐‐‐+‐‐‐‐‐‐‐+‐‐‐‐‐‐‐‐‐+
| id | base | rules | grammar |
+‐‐‐‐‐‐‐‐+‐‐‐‐‐‐+‐‐‐‐‐‐‐+‐‐‐‐‐‐‐‐‐+
| 189785 | seek | GRSZ | |
+‐‐‐‐‐‐‐‐+‐‐‐‐‐‐+‐‐‐‐‐‐‐+‐‐‐‐‐‐‐‐‐+

100. mysql> select * from word where ref = 189785;
+‐‐‐‐‐‐‐‐+‐‐‐‐‐‐‐‐‐+
| ref | word |
+‐‐‐‐‐‐‐‐+‐‐‐‐‐‐‐‐‐+
| 189785 | seek |
| 189785 | seeking |
| 189785 | seeker |
| 189785 | seeks |
| 189785 | seekers |
+‐‐‐‐‐‐‐‐+‐‐‐‐‐‐‐‐‐+

101. YAPC attendee
seeks where to
drink after the
evening talk.

102. Morphology
YAPC attendee
seeks where to
drink after the
evening talk.

103. Stop words
YAPC attendee
seeks where to
drink after the
evening talk.

104. YAPC attendee
seeks where to
drink after the
evening talk.

105. yapc attendee
seeks where to
drink after the
evening talk.

107. DEMO
live demonstration at
http://booksearch.andy.sh

108. __END__
Andrew Shitov
http://andy.sh