If you add a method, keep in mind two things: (1) the first argument will
always be a list of nodes from which to filter. In the case of context
methods (such as position), the function should return an array with a
value for each child in the array. (2) all method calls from XML will have
"-" replaced with "_". Therefore, in XML,
"local-name()" is identical (and actually becomes) "local_name()"
A node-set is converted to a string by returning the string-value of the
node in the node-set that is first in document order. If the node-set is
empty, an empty string is returned.
A number is converted to a string as follows
NaN is converted to the string NaN
positive zero is converted to the string 0
negative zero is converted to the string 0
positive infinity is converted to the string Infinity
negative infinity is converted to the string -Infinity
if the number is an integer, the number is represented in decimal form as a
Number with no decimal point and no leading zeros, preceded by a minus sign
(-) if the number is negative
otherwise, the number is represented in decimal form as a Number including
a decimal point with at least one digit before the decimal point and at
least one digit after the decimal point, preceded by a minus sign (-) if
the number is negative; there must be no leading zeros before the decimal
point apart possibly from the one required digit immediately before the
decimal point; beyond the one required digit after the decimal point there
must be as many, but only as many, more digits as are needed to uniquely
distinguish the number from all other IEEE 754 numeric values.
The boolean false value is converted to the string false. The boolean true
value is converted to the string true.
An object of a type other than the four basic types is converted to a
string in a way that is dependent on that type.
Take equal portions of Mike Stok and Sean Russell; mix vigorously, and pour
into a tall, chilled glass. Serves 10,000.
a string that consists of optional whitespace followed by an optional minus
sign followed by a Number followed by whitespace is converted to the IEEE
754 number that is nearest (according to the IEEE 754 round-to-nearest
rule) to the mathematical value represented by the string; any other string
is converted to NaN
boolean true is converted to 1; boolean false is converted to 0
a node-set is first converted to a string as if by a call to the string
function and then converted in the same way as a string argument
an object of a type other than the four basic types is converted to a
number in a way that is dependent on that type
