A schema specifies a set of element names, the names and datatypes of any attributes associated with them, and rules about the contexts in which they may legally appear.A schema for our simple example above will say that elements named <doc>, <p>, <placeName> etc exist. It may also specify that <p> elements may appear within <doc> elements, that <placeName> s may appear within <p> s, that the attribute @n must have a numeric value etc. Note however that an XML schema still has no way of specifying that the tag <placeName> indicates the name of a place, or what we mean by “a place”: such additional semantic constraints must be specified elsewhere, for example by documentation such as that provided by the TEI Guidelines (Burnard 2014, 15-16).


A set of formally expressed rules concerning the markup of a document (Burnard 2014, 110).

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