If you use XML with no DTD, then these five character entities are assumed to be predeclared, and you can use them without declaring them:
Code:
< - The less-than character
& - The ampersand character
> - The greater-than character
" - The double-quote character
' - The apostrophe or single-quote character
If you are using a DTD then you must declare all the character entities you need to use (if any), including any of the five above that you plan on using (they cease to be predeclared if you use a DTD). If you are using a Schema, you must use the numeric form for all except the five above because Schemas have no way to make character entity declarations.
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