ails of this are provided in the advanced section.</P>
<P>
If the parser is not passed a well-formed expression, or if it is unable to successfully parse the string for some other reason, it returns an error code. The error codes are described at length in the advanced section.</P>

<H4 CLASS="HeadingC">
The Parser's Grammar</H4>
<P>
The parser uses a context-free grammar to make sure the string is well-formed. The grammar is listed below. The basic units of the grammar are listed in ALL-CAPS; higher-level 