Print an attribute value. Value is either atomic or one of the
following terms:
- A+B
Concatenation of A and B
encode(V)
Emit URL-encoded version of V. See www_form_encode/2.- An option list
Emit ?Name1=
encode(Value1)&Name2=encode(Value2) ...
- A term Format-Arguments
Use format/3 and emit the result as quoted value.
The hook expand_attribute_value//1 can be defined to
provide additional `function like' translations. For example,
http_dispatch.pl defines location_by_id(ID) to refer to a
location on the current server based on the handler id. See
http_location_by_id/2.
