The number of characters to skip before searching for the text for the
token. The offset can have the following values:
1 or higher moves the specified number of characters before
trying to match the token’s text.
0 searches for text at the current parse position. This is
the default value.
-1 indicates the token’s text will be matched at the
current parse position, but the parse position will not go past the string
specified in the termToken attribute, if present.
termToken
A string that indicates parsing should stop for this token. The parse
position will be the character after the termToken string.
The termToken attribute can only be used if the offset attribute is
negative one (-1).
