PS> Protocol Stack and 'targetDevice.xsd' to simple URLs

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Hi Dave, Thursday (9 January 2003)

Below is a a PSI protocol stack diagram to disambiguate our terminology
and my best effort to replace the PSI-specific 'targetDevice.xsd' with
simple URLs (with examples and notes).

Cheers,
- Ira McDonald
  High North Inc

----------------------------------------
* PSI Protocol Stack

|-------------------------|
|7 - Application Layer |
|PSI Client or PSI Server |
|-------------------------|
|6 - Presentation Layer |
|WSDL/SOAP |
|-------------------------|
|5 - Session Layer |
|HTTP |
|-------------------------|
|4 - Transport Layer |
|[TLS] |
|TCP |
|-------------------------|
|3 - Network Layer |
|IP |
|-------------------------|
|2 - Datalink Layer |
|Ethernet, Bluetooth, etc.|
|-------------------------|
|1 - Physical Layer |
|Wire, light, radio, etc. |
|-------------------------|

----------------------------------------
* Replace 'targetDevice.xsd' with simple URLs

TCP Port
--------

Example:
   raw-tcp://somehost.com:9100

Notes:
   (1) REQUIRED 'host' or 'ip-addr' MUST be specified
   (1) REQUIRED 'port' MUST be specified (cannot be defaulted)

Background:

See the "raw-tcp:" URL scheme defined in the IANA-registered SLPv2
"direct print" template in the directory:

   ftp://ftp.iana.org/assignments/svrloc-templates

in the file:

   printer_raw-tcp.1.0.en

which extends the base SLPv2 Printer Template v2.0

Fax

---
Example:
   fax:+358.555.1234567
Background:
See "fax:" URL scheme defined in "URLs for Telephone Calls" (RFC 2806).
UNC
---
Example:
   pwg-unc:\\myprintserver\myprinter
Notes:
   (1) Proposed new PWG standard URL scheme for UNC encapsulation
   (2) ALL printable ASCII characters are legal in the UNC, including
       the BACKSLASH (0x5C)
Background:
Microsoft uses UNC identifiers in Windows environments.
PSI Service Endpoint
--------------------
Example:
   pwg-psitd://mypsitarget.mydomain.com:3700/psitd
Notes:
   (1) REQUIRED 'host' or 'ip-addr' MUST be specified
   (2) OPTIONAL 'port' MUST default to IANA-assigned value
       (example assumes port '3700')
Background:
PSI standard URL schemes are defined elsewhere in this PSI spec.

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