What is the size of special characters for facettes?

How are handle the special characters for length related facettes in an xml schema ? Are they one character, or the number with special form ?

For instance, is < (<) one character, or four characters ?

if it is four characters, how is it p开发者_运维百科ossible to say to the users something like Excuse me, if you type < it's four characters ?

Thanks.

---

The XML escapes are handled prior to schema validation. So, if the XML has:

<myelement>4 &lt; 5</myelement>

Then the myelement content is "4 < 5", which is 4 characters.