On demand documents and deferred document assembly
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On-Demand Documents and Deferred Document Assembly. Karen Witting – IBM Co-chair ITI Technical Committee. On-Demand Documents Use Case. Useful for sources of healthcare data which prefer to find and assemble most up-to-date document content at the time of requests for content

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On-Demand Documents and Deferred Document Assembly

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On demand documents and deferred document assembly

On-Demand Documents and Deferred Document Assembly

Karen Witting – IBM

Co-chair ITI Technical Committee


On demand documents use case

On-Demand Documents Use Case

  • Useful for sources of healthcare data which prefer to find and assemble most up-to-date document content at the time of requests for content

  • Finding and assembling data upon retrieve request Documents On-Demand

  • On-Demand Supplement Supports:

    • Registration of On-Demand Documents

    • Single Consumer Query lists stable documents and on-demand data sources

    • Consumer Retrieve from on-demand data sources causes document content to be dynamically identified and assembled


Xds on demand documents actors transactions

XDS On-Demand Documents Actors/Transactions


Xds document entry types

XDS Document Entry types

  • XDS Document Entry types defined

    • Stable Document Entry – metadata about a specific and static set of healthcare content formed into a document. The source registers a Stable Document Entry when a meaningful collection of data should be published based on clinical events.

    • On-Demand Document Entry – metadata describing the characteristics of a set of on-demand content and a unique identifier which can be used to create a document which collects the latest, most recent available information at the time of retrieval.


Xds on demand workflow

XDS On-Demand Workflow


Xca workflow no xds

XCA workflow (no XDS)


Deferred document assembly use case

Deferred Document Assembly Use Case

  • Allows some sources of healthcare data to operate in a more efficient way

  • Allows source systems to register the existence of stable document content but defer actually assembling the document content only if and when it is retrieved.

  • Preferred in an application architecture where a great deal of content is available for sharing but saved as a set of distinct elementary records in a clinical database and not as documents. To convert all this content to documents is considered a waste of resources for any document which is never requested. Thus, only content that is specifically requested is formed into a document.


Deferred document assembly

Deferred Document Assembly

  • Deferred Document Assembly - Small enhancement XDS

    • Content for a document identified and internally labeled

    • Register documents with special hash/size 0 indicating deferred assembly

      • Size = 0 (zero)

      • hash = da39a3ee5e6b4b0d3255bfef95601890afd80709 (SHA1 hash of a zero length file)

    • At retrieve previously identified content is assembled into document and hash/size updated

    • Repeated retrieve requests always returns the exact same content

  • Actors

    • Integrated Document Source/Repository grouped with Document Administrator declares Deferred Documents Option

    • Document Registry with Document Metadata Option

    • Document Consumer with Deferred Documents Option

  • Workflow

    • Integrated Document Source/Repository registers Stable Entry with:

      • Size = 0 (zero)

      • hash = da39a3ee5e6b4b0d3255bfef95601890afd80709 (SHA1 hash of a zero length file)

    • Document Consumer retrieves document causing Document Source/Repository to assemble content, update size/hash in Document Registry and return complete content


Xds deferred workflow

XDS Deferred Workflow


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