Which parts of an XML document are case-sensitive?
Answer:
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 <BODY>…</body>: upper- and lower-case must match; thus
<Img/>, <IMG/>, and <img/> 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 <PIC
width="7in"/> and <PIC WIDTH="6in"/> (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 casesensitive
as always.
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 <BODY>…</body>: upper- and lower-case must match; thus
<Img/>, <IMG/>, and <img/> 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 <PIC
width="7in"/> and <PIC WIDTH="6in"/> (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 casesensitive
as always.
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