Value for boolean attribute

[SteveMurphy]

I'm designing an XML file and one of the elements will have a true/false attribute. In terms of style, which of the following would be the best way to implement the attribute?

• IsBullet="true"/IsBullet="false"
• IsBullet="yes"/IsBullet="no"
• IsBullet="1"/IsBullet="0"

Each item in the preceding list represents one possible way to implement my attribute. Each item shows my suggested way to represent the two possible values for the attribute.Thanks.

[jesh]

If you ever plan on moving the data over to a database rather than an XML file, it might be best to stick with the true = 1 and false = 0 because of the way databases store booleans. Also, "1" uses less memory than "yes" or "true". I'd choose this one:

IsBullet="1"/IsBullet="0"

[boen_robot]

jesh has a good point (two infact).One thing I could add is that if you plan to use XML Schema, you should check out which of the three models validates as the xs:boolean type. It's not critical if the third doesn't though. You can always force a node to be valid only on certain set of values (obviosly 0 and 1 in this case).