Dan Driscoll's Blog
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On the wire
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Dan Driscoll's Blog
on the wire
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Using MTOM to set up binary streams
The SOAP Message Transmission Optimization Mechanism is a building-block spec that DPWS profiles so that specifications built on top can use it in a consistent and device-friendly way. MTOM isn't used in any of DPWS's messages, but it is available to solution authors and is included in many specs built...
29 Jun 2009
xAddrs optionality in WS-Discovery messages
Traditional big web services, like a billing system or a service running in the cloud, nearly always have fixed addresses--often HTTP URLs. Smaller web services, such as those on a PC or a device, often have logical identifiers ("urn:uuid:c3de740f-9227-4706-b3ee-9494243c040d") that let you recognize...
2 Apr 2009
Discovery-layer types in DPWS applications
The roles of Types in WS-Discovery messages is really clear for generic, non-DPWS services. Types are qualified names expressed in the <d:Types> element of WS-Discovery messages, and these names identify a set of operations; the service advertised in the WS-Discovery message supports those operations...
28 Feb 2009
Expirations in WS-Eventing
WS-Eventing is one of the building-block specifications that DPWS profiles and makes available for solution authors. Some applications require the device to send notification messages back to the client; e.g., a printer sends a message to the PC when it has finished printing a document. WS-Eventing doesn...
30 Nov 2008
UUID URI schemes
UUIDs (related to GUIDs ) are used frequently in computing applications. If you don't know these by name, you will probably recognize the 128-bit value in the format in which it is typically rendered: 7673868d-231e-490d-9c4f-19288e7e668d This is just an example value--these are usually generated...
19 Sep 2008
Empty Types field in a WS-Discovery Probe
I've been talking an awful lot lately about WSDAPI, Microsoft's implementation of the Devices Profile for Web Services, but I also work a good deal on the wire side of WSDAPI, and want to talk a little bit about how I interpret an edge case of a WS-Discovery message. The wire and me Before I dive...
17 Jan 2008
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