TEXT ENCODING INITIATIVE TEI

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TEXT ENCODING INITIATIVE (TEI)

• Inf 384C
• Block II, Module C

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TEI History

• The developing organizations first met in 1987
• Association for Computers and the Humanities
  (ACH)
• Association for Computational Linguistics (ACL)
• Association for Literary and Linguistic Computing
  (ALLC)
• 1990first Version TEI P1
• 1992TEI P2
• 1993TEI P3

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TEI History Continued

• Principles for the development of TEI
• Standard format for data interchange in
  humanities research
• Guidelines for encoding texts in the same format
• Define a recommended syntax
• Define a meta language for description of
  text-encoding schemes
• Future Developments
• Linguistic description and grammatical annotation
• Historical analysis and interpretation
• Base tag sets for further document types
• Manuscript analysis and physical description of
  text

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General Introduction to SGML and XML
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The Evolution of SGML and XML

• 1960 Generalized Markup Language by IBM 1960s
• 1970s 1980s ANSI initiates project to develop
  a Standard text-description language based on GML
• 1983 SGML became an industry standard
• 1986 ISO ratified a standards for SGML
• 1990s Tim Berners-Lee developed HTML a simple
  formatting markup language for the World Wide Web
• Mid 1990s XML was developed by the W3C to
  combine the flexibility of SGML and the
  simplicity of HTML

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Benefits of SGML and XML

• SGML is a toolkit for developing specialized
  markup languages
• Specifies the structure of information
• Enables interoperability between multiple
  platforms
• Acts like a database
• ail encompassing
• The DTD acts as a blueprint for document
  structure
• XML provides a manageable framework in which you
  can define your own elements

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XML Syntax

• Information content must have start and end tags
• Case is significant
• Elements may not overlap
• Elements can nest one inside another

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The XML Environment

• XML Editor
• XML Parser/Validator
• Display program
• DTD or schema to define elements
• Style sheet for display of elements

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The XML Document

• Document prologue
• XML declaration
• Document type declaration
• Points to root element
• Points to external standards (DTDs, namespaces)
• Document itself
• Bracketed by root element
• Contains elements, attributes, entities

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The Document Type Definition
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The DTDDocument Type Definition

• DTD defines a documents structure
• i.e. it is a set of rules and declarations that
  specify what tags can be used and what these tags
  can contain
• DTD validates documents
• - determines which documents conform to
  language
• - reduces possibility of errors
• DTD provides blueprint for documents
• - specifies how to handle elements
• - specifies which elements are allowed

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The DTDDocument Type Definition

• The DTD has four main functions
• 1. declares a set of allowed elements
  vocabulary
• 2. defines content model for each element
  grammar
• 3. declares set of allowed attributes for each
  element
• 4. provide various mechanisms to make
  management of model easier
• (Ray, Chapter 5, p 148)

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Basic Structure of DTD-Element Declaration-

• lt!Element name (content-model)gt
• Holds two functions
• Adds a new element
• States what can go inside the element
• For every element that appears in the document,
  one must be identified in the DTD
• Order of declarations is important

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lt!Element name (content-model)gt
?
?

• vocabulary
• Denotes NAME of element that appears in mark-up
  tag
• (case-sensitive-LOWER)
• e.g. title, graphic, article, thingie

• grammar
• Formula that delineates what kind of content, how
  many and in what order
• Empty elements EMPTY
• No content restrictions (little value) ALL
• Only character data, no elements PCDATA
• Only elements formula
• Mixed Content content model

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Basic Structure of a DTD-Attribute Declaration-

• lt!attlist name (attname1 atttype1
  attdescl1)
• (attname2 atttype2 attdescl2)gt
• For each element that appears in document,
  attributes of the
• element must be declared
• All attributes are declared in one place,
  attribute list

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lt!attlist name (attname1 atttype1
attdescl1)gt ?
?

• vocabulary
• Name of element to which the attributes belong
• Same as name as element declared earlier
• e.g. title, article, thingie

• Attribute declarations
• attname1 Gives attribute name
• atttype1 Specifies datatype of
• attribute, list of values
• CDATA, NMTOKEN, ID
• attdesc1 Describes behavior
• 1. default value high
• 2. author specified value
• REQUIRED, FIXED, IMPLIED

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The DTDDocument Type Definition

• It is important to remember that every document
  type definition is an interpretation of a text.
  There is no single DTD which encompasses any kind
  of absolute truth about a text, although it may
  be convenient to privilege some DTDs above others
  for particular types of analysis.
• TEI Guidelines for Electronic Text Encoding and
  Interchange
• http//etext.virginia.edu/TEI.html

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The TEI DTD

• Uses basic structural elements of general DTD
• Designed to simplify the task of choosing an
  appropriate set of tags for the text in hand.
• Selects appropriate combination of smaller tag
  sets, each containing some set of tags likely to
  be used together
• 1. core tag sets standard components that are
  always included, no encoder action
• 2. basic tag sets basic building blocks for
  text types, encoder must select at least one
• 3. additional tag sets extra tags compatible
  with all other tag sets, encoder may add with
  basic tags in any combination
• http//www.tei-c.org/P4X/DTD/

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The TEI Header
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Basic Elements of TEI

• Paragraphs ltpgt
• Punctuation ltstop.abbrgt, ltstop.sentgt
• Quotations ltqgt or ltquotegt
• Lists ltlistgt, ltitemgt etc.
• Bibliographic Citations ltbiblgt
• THE HEADER! ltteiHeadergt

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The TEI Header

• Required of every TEI text, composed of four
  parts
• May be large and complex or very simple
• The header may differ for documents not based on
  written text, such as computer files or spoken
  text
• The header is not a library cataloging record,
  although the intent is similar

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Four Parts

• File Description ltfileDescgt
• Encoding Description ltencodingDescgt
• Text Profile ltprofileDescgt
• Revision Description ltrevisionDescgt

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File Description ltfileDescgt

• lttitleStmtgt
• lteditionStmtgt
• ltextentgt
• ltpublicationStmtgt
• ltseriesStmtgt
• ltnotesStmtgt
• ltsourceDescgt

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Encoding Description ltencodingDescgt

• ltprojectDescgt
• ltsamplingDeclgt
• lteditorialDeclgt
• lttagsDeclgt
• ltrefsDeclgt
• ltclassDeclgt
• ltfsdDeclgt
• ltmetDeclgt
• ltvariantEncodinggt

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Profile Description ltprofileDescgt

• ltcreationgt
• ltlangUsagegt
• lttextClassgt

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Revision Description ltrevisionDescgt

• ltrevisionDescgt
• ltchangegt

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Examples and Application
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Examples and Application

• Dumble Geological Survey
• A Geological survey of Texas from the late 19th
  Century comprised of twelve volumes
• Digitally imaged monographs processed with OCR
  software to produce text
• Text marked up in XML using the TEI Lite
  specifications
• http//www.lib.utexas.edu/books/dumble/

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Dumble DTD

• Element and Attribute definitions
• Entity references

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Dumble Header

• Four basic sections
• File description
• Encoding description
• Profile description
• Revision description
• Contains bibliographic information
• Contains information on the creation of the
  digital file

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Why XML?

• Ability to record information about a document
  within the document.
• Ability to separate structure from format
• Ability to wrap or embed information in layers
  of xml

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XML Beyond TEI

• Open Archives Initiative (OAI)
• Semantic Web
• Open Archival Information System
• Digital Preservation
• Information Discovery

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References

• A Sample TEI Markup
• Appendix A.2 Elements in TEI Lite
• OAI
• OAIS
• Learning XML

• www.tei-c.org/Lite/U5-eg.html
• www.tei-c.org/Lite/U5-taglist.html
• www.openarchives.org/
• http//www.rlg.org/longterm/oais.html
• Erik T. Ray