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  • Blog Post: 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...
  • Blog Post: 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...
  • Blog Post: 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...
  • Blog Post: 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...
  • Blog Post: 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...
  • Blog Post: 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...
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