Attributes are additional parameters to an element. In the XML syntax, they can only appear with the opening tag of an element:
<WARPIN VERSION="0.9.8">
...
</WARPIN>
Attributes consist of an attribute name and a value, separated by =. An attribute must have a value, and the value must be in either double or single quotes. (The single-quote character may be used if the value contains a double-quote character, and vice versa.)

You can escape quotes using predefined entities.