The CCOW standard allows individual organizations to define custom subjects or custom items for standard subjects. Custom subjects and items need to follow the data definitions and mandatory naming convention rules specified in the document Health Level-Seven Standard Context Management Specification, Subject Data Definitions.
The general scheme is to add a meta-descriptor as a prefix to the subject or item name. This unique descriptor should use the organization's World Wide Web Consortium (W3C) domain name. An example of a custom subject, shown as having been defined by Medicor Imaging, is:
[medicorimaging.com]DateRange
An example of an item within a custom subject is: [medicorimaging.com]DateRange.id.[ medicorimaging.com]StartDate
An example of a custom item within the standard patient subject, shown as defined by GE/Marquette Medical Systems: Patient.Co.[mei.com]Current_medications
The descriptor can be omitted when the desired descriptor can be inferred from the following rules:
An organization can define custom items for a custom subject defined by another organization. The following examples denote three different items for the same custom subject: [medicorimaging.com]DateRange.id.[ medicorimaging.com]StartDate [medicorimaging.com]DateRange.id.[mipacs.com]EndDate [medicorimaging.com]DateRange.id.[mipacs.com]StartDate Note: that the item [medicorimaging.com]DateRange.id.[mipacs.com]StartDate is not the same as [medicorimaging.com]DateRange.id.[ medicorimaging.com]StartDate.
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