- it consist letters, numbers, and other characters
- Names must not start with a number or punctuation
- Names must not start with the letters xml (or XML, or
- Names cannot contain spaces
Take care when you "invent" element names and follow these
Any name can be used, no words are reserved, but the idea is
to make names descriptive. Names with an underscore separator
Examples: <first_name>, <last_name>.
Avoid "-" and "." in names. For example, if you name
something "first-name," it could be a mess if your software
tries to subtract name from first. Or if you name something "first.name,"
your software may think that "name" is a property of the object
Element names can be as long as you like, but don't
exaggerate. Names should be short and simple, like this: <book_title>
not like this: <the_title_of_the_book>.
XML documents often have a corresponding database, in which
fields exist corresponding to elements in the XML document. A
good practice is to use the naming rules of your database for
the elements in the XML documents.
Non-English letters like Ú˛ß are perfectly legal in XML
element names, but watch out for problems if your software
vendor doesn't support them.
The ":" should not be used in element names because it is
reserved to be used for something called namespaces (more later).