Quote Styles, "female" or 'female'?

[ben2ong2]

Attribute values must always be enclosed in quotes, but either single or double quotes can be used. For a person's sex, the person tag can be written like this:
<person sex="female">
or like this:
<person sex='female'>
Note: If the attribute value itself contains double quotes it is necessary to use single quotes, like in this example:
<gangster name='George "Shotgun" Ziegler'>
Note: If the attribute value itself contains single quotes it is necessary to use double quotes, like in this example:
<gangster name="George 'Shotgun' Ziegler">