DICOM PS3.18 2016a - Web Services

6.4.3.2 Response
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#### 6.4.3.2 Response

A Web Server shall extract information from each document specified in a Document Set Information Request. This shall be done by the logical equivalent of:

1. convert the non-pixel data for each of the requested data into an XML encoded form

2. apply each of the wado:XPath elements to this XML encoded form

3. provide the XPath response as part of the Document Set Information Response.

See PS3.19 for details on conversion to XML encoded form.

The Web Server shall return the XPath results or an error code when the document could not be processed.

The <wado:RetrieveImagingDocumentSetInformationResponse/> element for use with the Retrieve Imaging Document Set Response Message is additionally defined as:

- A required /wado:RetrieveImagingDocumentSetInformationResponse/rs:RegistryResponse element

- An optional sequence of <wado:DocumentInformationResponse/> elements containing:

  - A <ihe:HomeCommunityId/> element. The value of this element shall be the same as the value of the StudyRequest/SeriesRequest/DocumentRequest/HomeCommunityId element in the Request Message. If the <ihe:HomeCommunityId/> element is not present in the Request Message, this value shall not be present.

  - A required <ihe:DocumentUniqueId/> that identifies the document within the Web Server. The value of this element shall be the same as the value of the StudyRequest/SeriesRequest/DocumentRequest/DocumentUniqueId element in the original Request Message. This value corresponds to the SOP Instance UID.

  - A conditional <wado:FrameNumber/> that identifies the frame within the source document. It shall be present if and only if <wado:FrameNumber/> was in the request.

  - One <wado:XPathResponseList/> containing:

    - A required <wado:XPathResponse> that contains the XPath results for each <wado:XPath/> elements, in the same order as in the request encoded as an XOP Infoset. The response element shall be empty if there was no XPath match.

The /RetrieveImagingDocumentSetInformationResponse/rs:RegistryResponse/@status attributes provides the overall status of the request: It shall contain one of the following values:

- urn:oasis:names:tc:ebxml-regrep:ResponseStatusType:Success

- urn:ihe:iti:2007:ResponseStatusType:PartialSuccess

- urn:oasis:names:tc:ebxml-regrep:ResponseStatusType:Failure

For each document requested in a /RetrieveImagingDocumentSetInformationRequest/StudyRequest/SeriesRequest/DocumentRequest element:

- If the document is successfully retrieved (without warning) then no /RetrieveImagingDocumentSetInformationResponse/rs:RegistryResponse/rs:RegistryErrorList/ rs:RegistryError element shall be present and a /RetrieveImagingDocumentSetInformationResponse/DocumentResponse/Document element shall be returned containing the document as base64binary encoded data.

- If a warning is reported when retrieving the document, then a /RetrieveImagingDocumentSetInformationResponse/rs:RegistryResponse/rs:RegistryErrorList/ rs:RegistryError element shall be returned with:

  - @severity is urn:oasis:names:tc:ebxml-regrep:ErrorSeverityType:Warning

  - @errorCode is specified

  - @codeContext contains the warning message

  - @location contains the DocumentUniqueId of the document requested

  - The document shall be returned in an instance of /RetrieveDocumentSetResponse/DocumentResponse/Document as base64binary encoded data. The returned document and warning are correlated via the DocumentUniqueId.

- If an error is reported when retrieving a document, then a /RetrieveImagingDocumentSetInformationResponse/rs:RegistryResponse/rs:RegistryErrorList/ rs:RegistryError element shall be returned with:

  - @severity is urn:oasis:names:tc:ebxml-regrep:ErrorSeverityType:Error

  - @errorCode is specified

  - @codeContext contains the error message

  - @location contains the DocumentUniqueId of the document requested

  - No corresponding RetrieveDocumentSetResponse/DocumentResponse element shall be returned

The error conditions for failures and associated error codes are given below in section 6.4.4. These errors shall be detected and the associated errorCode returned if that error occurs. Additional errors defined in the ebRS standard, in ITI TF-2: 4.1.13 "Error Reporting", and defined by the implementer may be returned.

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DICOM PS3.18 2016a - Web Services