<animal>
<name language="English">T1</name>
<name language="Latin">T2</name>
<project>project1</project>
<weight>3 points</weight>
</animal>
Attribute names must follow the same rules as for valid element names.
If a value contains double quotes, use single quotes to contain the value (and vice versa).
An attribute may not contain a reference to an external entity.
An attribute may not contain the symbol <, use < to represent it.