[IPP] named services

[IPP] named services

[IPP] named services

Michael Sweet msweet at apple.com
Mon Jan 27 18:56:13 UTC 2014


Norbert,

Currently there is no notion of a default service in (standard) IPP or the SM.  CUPS has a pair of extension operations for getting and setting the default printer (and at one point even allowed a server to advertise it as a sort-of "default network printer" that clients could prefer, with the usual security caveats), however those operations are now rarely used as mobile computing has made the notion of a default printer location-specific.

What are you trying to do?

  
On Jan 27, 2014, at 1:23 PM, Norbert Schade <Norbert.Schade at conexant.com> wrote:

> Ok, found a ServiceName under ImagingServiceDescriptionType.
> I guess that will help me with the name.
>  
> You have another idea how to make one of many services the default?
>  
> From: Norbert Schade 
> Sent: Monday, January 27, 2014 12:41 PM
> To: 'Michael Sweet'
> Cc: ipp at pwg.org
> Subject: RE: [IPP] named services
>  
> There’s always the chance that I misinterpret something.
> But the excerpt below is from the ScanService.xsd schema. I can’t find anything that looks like what you have in mind.
> And so far I think I’m looking at the right object.
>  
>                 <!-- ScanServices - set of Scan services -->
>                 <xs:complexType name="ScanServicesType">
>                                 <xs:sequence>
>                                                 <xs:element ref="ScanService" minOccurs="0" maxOccurs="unbounded"/>
>                                 </xs:sequence>
>                                 <xs:anyAttribute namespace="##other" processContents="lax"/>
>                                 <!-- ScanServices - set of Scan services -->
>                 </xs:complexType>
>                 <xs:element name="ScanServices" type="ScanServicesType"/>
>                 <!-- ScanService - object -->
>                 <xs:complexType name="ScanServiceBaseType">
>                                 <xs:sequence>
>                                                 <xs:element ref="ScanServiceCapabilities" minOccurs="0"/>
>                                                 <xs:element ref="ScanServiceCapabilitiesReady" minOccurs="0"/>
>                                                 <xs:element ref="ScanServiceConfiguration" minOccurs="0"/>
>                                                 <xs:element ref="ScanServiceDefaults" minOccurs="0"/>
>                                                 <xs:element ref="ScanServiceDescription"/>
>                                                 <xs:element ref="ScanServiceStatus"/>
>                                                 <xs:any namespace="##other" minOccurs="0" maxOccurs="unbounded"/>
>                                 </xs:sequence>
>                                 <xs:anyAttribute namespace="##other" processContents="lax"/>
>                                 <!-- ScanService - object -->
>                 </xs:complexType>
>                 <xs:complexType name="ScanServiceType">
>                                 <xs:complexContent>
>                                                 <xs:extension base="ScanServiceBaseType">
>                                                                 <xs:sequence>
>                                                                                 <xs:element name="JobTable">
>                                                                                                 <xs:complexType>
>                                                                                                                 <xs:sequence>
>                                                                                                                                 <xs:element name="ActiveJobs" type="ScanJobsType"/>
>                                                                                                                                 <xs:element name="JobHistory" type="ScanJobsType" minOccurs="0"/>
>                                                                                                                                 <xs:any namespace="##other" minOccurs="0" maxOccurs="unbounded"/>
>                                                                                                                 </xs:sequence>
>                                                                                                 </xs:complexType>
>                                                                                 </xs:element>
>                                                                 </xs:sequence>
>                                                 </xs:extension>
>                                 </xs:complexContent>
>                 </xs:complexType>
>                 <xs:element name="ScanService" type="ScanServiceType"/>
>  
> From: Michael Sweet [mailto:msweet at apple.com] 
> Sent: Monday, January 27, 2014 12:18 PM
> To: Norbert Schade
> Cc: ipp at pwg.org
> Subject: Re: [IPP] named services
>  
> Norbert,
>  
> Doesn't the existing IPP printer-name attribute (SM ServiceName element) already provide this?
>  
>  
> On Jan 27, 2014, at 12:03 PM, Norbert Schade <Norbert.Schade at conexant.com> wrote:
>  
> 
> I am heavily working with the scan service these days.
> So my note comes out of that effort.
> But I think this is a rather general question after all.
>  
> A service is typically quite a complex object.
> A name that identifies a service on the highest level would in many cases ease the management and debugging of functionality that deals with services.
> And if I had more than one service in my scan service xml instance I’d prefer one to be the default (services have their own defaults, but a service itself cannot be the default within a services group).
>  
> I helped myself by adding a vendor extension (a simple attribute) to the ScanServices and ScanService objects.
>  
> I could even imagine to add an ID attribute to a ScanService object and an IDREF attribute to the ScanServices object.
> But I can’t really do that with vendor extensions.
>  
> Just wondering if other people also feel that a named service and a default reference to such a named service might improve the situation.
> Regards
> Norbert
>  
>  
> Norbert Schade
> Systems Engineer (printing)
> Imaging Solutions
> Conexant Systems, Inc.
> 201 Jones Road
> Waltham, MA 02451
> U.S.A.
> Tel: 1-781-370-8929
> Email: norbert.schade at conexant.com
>  
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>  
> _________________________________________________________
> Michael Sweet, Senior Printing System Engineer, PWG Chair
>  

_________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair

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