MFD> Use Case - Scan Service Discovery

MFD> Use Case - Scan Service Discovery

MFD> Use Case - Scan Service Discovery

McDonald, Ira imcdonald at
Thu May 17 12:57:11 EDT 2007


As promised at today's MFD WG telecon:

Use Case - Scan Service Discovery

Bill wants to discover the Scan Services available in his enterprise
network, so that he can choose one in the future when he wants to submit
a Scan Job.  Bill wants to discover Scan Services both statically (via
enterprise directories) and dynamically (via discovery protocols).  Bill
can statically discover Scan Services via an LDAP query to his
enterprise directory that searches for instances of an LDAP Scanner
schema (which represents a Scan Service or a Scan Device), similar to
the industry standard LDAP Printer schema (RFC 3712).  Bill can
dynamically discover Scan Services by a DNS query to his enterprise DNS
server that searches for instances of a DNS SRV (RFC 2782) record for a
Scan Service (to be registered w/ IANA).

[A suggestion - in the MFD Scan Service Model & Requirements spec,
each use case should be a numbered section (in the table of contents),
for each of reference in subsequent derived Design Requirements]

[Context about DNS-SD - sadly, Apple (Stuart Cheshire) has allowed
the DNS-SD Internet-Drafts to expire and apparently plans to submit
new ones at some unknown future date to be published as Informational
RFCs (documenting Bonjour behavior).  So registering the DNS SRV type
with IANA (and the DNS-SD site) is straightforward, but the actual
discovery protocol exists only in Apple publications - perhaps the PWG
can encourage Paul Danbold (Apple member of PWG) to improve on this

- Ira

Ira McDonald (Musician / Software Architect)
Chair - Linux Foundation Open Printing WG
Blue Roof Music / High North Inc
PO Box 221  Grand Marais, MI  49839
phone: +1-906-494-2434
email: imcdonald at

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