* support for draft-ietf-mmusic-sdp-comedia (TCP, symmetric RTP, etc)

* good test suite. Check draft-ietf-mmusic-sdp-implem.

* sync with sdp-parameters at IANA

* add att-field at unknown level from RFC3108

* simcap -RFC 3307: attributes sqn, cdsc, cpar, cparmin, cparmax

* RFC 3388: attributes mid and group.

* periods and repeat times

support for multiple character sets:
* >= 0 && <= 9        -----> <ctype.h>isdigit

* RFC 3264: Offer/answer model

* test: after each call to fsdp_parse_x, a check for the error code
must be done

* base64 encryption parameters

* Add: interface to unknown attributes

* What happens if some attribute is specified twice.

* somehow, when not returning FSDPE_OK return pointer to the string
that caused the error.

* find a good MAXDEFAULTFIELDLEN

* be pedantic about POS-DIGIT?

* 64-bit NTP timestamps, session ids, etc. (long long)

* string reallocation:  (from GNU sed)
/* increase a struct line's length, making some attempt at
   keeping realloc() calls under control by padding for future growth.  */
static void
resize_line(lb, len)
  struct line *lb;
  size_t len;
{
  lb->alloc *= 2;
  if (lb->alloc - lb->length < len)
    lb->alloc = lb->length + len;
  lb->text = REALLOC(lb->text, lb->alloc, char);
}

* NEXT_LINE MUST not eat nothing but line endings

* Calls for strtol: use the endptr parameter to check for
errors. (maybe a char *error_pointer)

* lower level check for? 
	- phone numbers
	- URIs
	- e-mails
