PDFlib Text Extraction Toolkit (TET) Manual

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Indexing metadata fields. The TET connector for MediaWiki indexes all standard document info fields. The value of each field will be fed to the index so that it can be used in searches. Since MediaWiki does not support metadata-based searches you cannot directly search for document info entries, but only for info entries as part of the full text. 48 Chapter 4: TET Connectors
5 Configuration 5.1 Indexing protected PDF Documents PDF documents may use the following means of protection: > A user password may be required for opening the document. > Permission settings may allow or prevent certain actions, including extracting page contents. > A master password may be required for changing permission settings or one of the passwords. TET honors PDF permission settings. The password and permission status can be queried with the pCOS paths encrypt/master, encrypt/user, encrypt/nocopy, etc. as demonstrated in the dumper sample. pCOS also offers the pcosmode pseudo object which can be used to determine which operations are allowed for a particular document. Content extraction status. By default, text and image extraction is possible with TET if the document can successfully be opened (this is no longer true if the requiredmode option of TET_open_document( ) was supplied). Depending on the nocopy permission setting, content extraction may or may not be allowed in restricted pCOS mode (content extraction is always allowed in full pCOS mode). The following conditional can be used to check whether content extraction is allowed: if ((int) tet.pcos_get_number(doc, "pcosmode") == 2 || ((int) tet.pcos_get_number(doc, "pcosmode") == 1 && (int) tet.pcos_get_number(doc, "encrypt/nocopy") == 0)) { /* content extraction allowed */ } The need for processing protected documents. PDF permission settings help document authors to enforce their rights as creators of content, and users of PDF documents must respect the rights of the document author when extracting text or image contents. By default, TET will operate in restricted mode and refuse to extract any contents from such protected documents. However, content extraction does not in all cases automatically constitute a violation of the author’s rights. Situations where content extraction may be acceptable include the following: > Small amounts of content are extracted for quoting (»fair use«). > Organizations may want to check incoming or outgoing documents for certain keywords (document screening). > The document author himself may have lost the master password. > Search engines index protected documents without making the document contents available to the user directly (only indirectly by providing a link to the original PDF). The last example is particularly important: even if users are not allowed to extract the contents of a protected PDF, they should be able to locate the document in an enterprise or Web-based search. It may be acceptable to extract the contents if the extracted text is not directly made available to the user, but only used to feed the search engine’s index so that the document can be found. Since the user only gets access to the original pro- 5.1 Indexing protected PDF Documents 49
Page 1 and 2: PDFlib GmbH München, Germany www.p
Page 3 and 4: Contents 0 First Steps with TET 7 0
Page 5: 10.9 Option Handling 151 10.10 pCOS
Page 8 and 9: 0.2 Applying the TET License Key Us
Page 11 and 12: 1 Introduction The PDFlib Text Extr
Page 13 and 14: may extract some text which is not
Page 15 and 16: 2 TET Command-Line Tool 2.1 Command
Page 17 and 18: Constructing TET command lines. The
Page 19 and 20: Extract images and generate TETML i
Page 21 and 22: 3 TET Library Language Bindings Thi
Page 23 and 24: TET_CATCH(tet) { printf("Error %d i
Page 25 and 26: 3.4 COM Binding Installing the TET
Page 27 and 28: 3.6 .NET Binding The .NET edition o
Page 29 and 30: 3.8 PHP Binding Installing the TET
Page 31 and 32: 3.9 Python Binding Installing the T
Page 33 and 34: Exception Handling in RPG. TET clie
Page 35 and 36: 4 TET Connectors TET connectors pro
Page 37 and 38: 4.2 TET Connector for the Lucene Se
Page 39 and 40: Indexing metadata fields. The TET c
Page 41 and 42: 4.4 TET Connector for Oracle The TE
Page 43 and 44: these options on the command line.
Page 45 and 46: TET PDF IFilter is freely available
Page 47: tracts text and metadata from the P
Page 51 and 52: 5.2 Resource Configuration and File
Page 53 and 54: tet/3.0/resource /tet/3.0/resource/
Page 55 and 56: Geometry. The geometry features may
Page 57 and 58: 6 Text Extraction 6.1 Document Doma
Page 59 and 60: How to search with Acrobat 8/9: not
Page 61 and 62: 6.2 Unicode Concepts Unicode encodi
Page 63 and 64: artificial characters which will be
Page 65 and 66: width (x, y) beta fontsize baseline
Page 67 and 68: 6.4 Support for Chinese, Japanese,
Page 69 and 70: Options for text filtering. There a
Page 71 and 72: 6.6 Content Analysis PDF documents
Page 73 and 74: Dehyphenation. Hyphenated words at
Page 75 and 76: Table 6.3 Document styles docstyle=
Page 77 and 78: Fig. 6.5 Sample font reports create
Page 79 and 80: glyphmapping {{fontname=Warnock* to
Page 81 and 82: 7 Image Extraction 7.1 Image Extrac
Page 83 and 84: 7.2 Image Geometry Using TET_get_im
Page 85 and 86: 7.3 Image Analysis Image merging. S
Page 87 and 88: 7.4 Restrictions and Caveats Image
Page 89 and 90: 8 TET Markup Language (TETML) 8.1 C
Page 91 and 92: Depending on the sele
Page 93 and 94: You can specify the amount of text
Page 95 and 96: Table 8.3 TETML elements TETML elem
Page 97 and 98: 8.4 Transforming TETML with XSLT Ve
Page 99 and 100:
Run the program as follows: nxslt3.
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8.5 XSLT Samples The TET distributi
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Alphabetical list of words in the d
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9 The pCOS Interface The pCOS (PDFl
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9.2 Handling Basic PDF Data Types p
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9.3 Composite Data Structures and I
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Path prefixes. Prefixes can be used
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Table 9.3 Universal pseudo objects
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Table 9.4 Pseudo objects for PDF ob
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Table 9.5 Pseudo objects for resour
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9.6 Encrypted PDF Documents pCOS su
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10 TET Library API Reference 10.1 O
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10.2 General Functions Perl PHP res
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Returns Scope Bindings The converte
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10.3 Exception Handling C++ string
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10.4 Document Functions C++ int ope
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Table 10.3 Document options for TET
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C++ C int open_document_callback(vo
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Table 10.5 Page options for TET_ope
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Table 10.6 Suboptions for the conte
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Table 10.7 Suboptions for the layou
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Table 10.9 Suboptions for the struc
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C++ const TET_char_info *get_char_i
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10.7 Image Retrieval Functions C++
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C++ int write_image_file(int doc, i
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10.8 TET Markup Language (TETML) Fu
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10.9 Option Handling C++ void set_o
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10.10 pCOS Functions The full pCOS
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If the object has type stream all f
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A TET Library Quick Reference The f
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B Revision History Revision history
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unsupported types 87 XMP metadata 8
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