The TEI Guidelines
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«
^
»
are
Guidelines
: not prescriptive
summarize a consensus about the
significant particularities
of a huge range of (mostly) textual materials
are expressed as two fat volumes of prose (with examples) and (inextricably mixed with it) a set of formal definitions
the definitions can be expressed in a variety of schema languages:
in TEI P1-P3 (1991-1999) as a modular SGML DTD
in TEI P4 (2000) as an SGML or XML DTD
in TEI P5 (2005-) as XML DTD, W3C Schema, or RelaxNG
CIDOC 2005: TEI Tutorial: intro
