All of it, both markup and text. This is significantly different from HTML and most other SGML applications. It was
done to allow markup in non-Latin-alphabet languages, and to obviate problems with case-folding in writing systems
which are caseless.
* Element type names are case-sensitive: you must follow whatever combination of upper- or lower-case you use to
define them (either by first usage or in a DTD or Schema). So you can't say …: upper- and lower-case
must match; thus ![]() , ![]() , and ![]() are three different element types;
* For well-formed XML documents with no DTD, the first occurrence of an element type name defines the casing;
* Attribute names are also case-sensitive, for example the two width attributes in and (if they occurred in the same file) are separate attributes, because of the different case of width
and WIDTH;
* Attribute values are also case-sensitive. CDATA values (eg Url="MyFile.SGML") always have been, but NAME types (ID
and IDREF attributes, and token list attributes) are now case-sensitive as well;
* All general and parameter entity names (eg Á), and your data content (text), are case-sensitive as always.
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