Recent Articles

Medication frequency of “once”

September 29th, 2014|0 Comments

The XML syntax for representing a medication frequency of “once” (i.e. “take a single pill one time on a given date”) in a CDA document, is both simple and subtle.

In a CDA document, here […]

Rendering Time-Zones

August 6th, 2014|0 Comments

The article Moments in time in CDA, overviews the format used to represent a “timestamp” in CDA documents. It also presents several examples of timestamps. For example, the representation of August 22, 2013 6:15pm in […]

Using “combined type” time intervals

March 23rd, 2014|0 Comments

The “Combined Type” Time Interval
The article Combining time intervals in CDA, introduces and overviews the most sophisticated form of time expression in a CDA document, which we term the “combined type” time interval.

In the XML […]

The operator attribute

February 19th, 2014|0 Comments

The operator attribute is used with XML elements that represent times in a CDA document. It is used to enable multiple XML elements that represent dates and time to be “combined” together to form more complex […]

Using “Parenthetical Expressions” in SIGs

February 18th, 2014|0 Comments

The article Combining time intervals in CDA, overviews the use of the xsi:type attribute and the operator attribute, within an effectiveTime element, in order to combine multiple time intervals to express, for example, the schedule […]

The copyTime element

February 6th, 2014|0 Comments

The copyTime element potentially appears directly under the ClinicalDocument root XML element of a CDA document.

It is deprecated and should no longer be used in CDA documents.

In an earlier version of the CDA standard, it […]

The time element

February 6th, 2014|0 Comments

Throughout the XML hierarchy of a CDA document, there are XML elements named time that are intended to represent a specific date/time, or a time period.

In several places in the CDA Header, the time element is intended to take on a time-stamp value (a […]

The birthTime element

February 6th, 2014|0 Comments

The birthTime element represents a time-stamp (or “moment in time” – in this case, typically, a “date-stamp”) indicating the birth date of a person. Refer to the article Moments in time in CDA for details […]

The effectiveTime element

February 6th, 2014|0 Comments

Throughout the XML hierarchy of a CDA document, there are XML elements named effectiveTime that are intended to represent a time period.

One instance of the effectiveTime element is intended to take on a timestamp value representing a moment in time (usually […]

What is the role of the xsi:type attribute in CDA?

February 6th, 2014|0 Comments

Note: Prior to reading this article, if you need an overview of XML Namespaces as they pertain to CDA, we recommend that you invest five minutes to review the CDA PRO Learn session titled XML Namespaces.

The XML namespace for […]

Moments in time in CDA

February 6th, 2014|0 Comments

Note: Refer to the article Dates and times in CDA for an overview of that subject, and links to other relevant CDA PRO Know articles and CDA PRO Learn sessions.

A moment in time is often termed a […]

Event-related time intervals in CDA

February 6th, 2014|0 Comments

Note: Refer to the article Dates and times in CDA for an overview of the subject and links to other relevant CDA PRO Know articles and CDA PRO Learn sessions.

There are many contexts in which an XML sub-element is […]

Combining time intervals in CDA

February 6th, 2014|0 Comments

Note: Refer to the article Dates and times in CDA for an overview of the subject and links to other relevant CDA PRO Know articles and CDA PRO Learn sessions.

There are many contexts in which an XML sub-element is […]

Dates and times in CDA

February 6th, 2014|0 Comments

There are many contexts throughout a CDA document, in which dates and times need to be represented.

Note that time as a “unit of measurement” – for example the “seconds” in a measurement of heart rate […]

Periodic time intervals in CDA

February 6th, 2014|0 Comments

Note: Refer to the article Dates and times in CDA for an overview of the subject and links to other relevant CDA PRO Know articles and CDA PRO Learn sessions.

There are many contexts in which an XML sub-element is […]

A very common mistake with date ranges

February 6th, 2014|0 Comments

The article Time intervals in CDA, presents the overall XML syntax for expressing a contiguous time period in a CDA document. It mentions the inclusive attribute used within the low and high elements that represent […]

Always extend date range endpoints to seconds resolution

February 6th, 2014|0 Comments

The article A very common mistake with date ranges, explains a common mistake that CDA implementations often make when it comes to the XML syntax for expressing date ranges in CDA documents.

The correct way to express […]

Time intervals in CDA

February 6th, 2014|0 Comments

Note: Refer to the article Dates and times in CDA for an overview of the subject and links to other relevant CDA PRO Know articles and CDA PRO Learn sessions.

There are many contexts in which an XML sub-element is […]

Timestamps stand-alone vs. endpoints of a time range

February 6th, 2014|0 Comments

Timestamp Granularity Stand-Alone
The article Moments in time in CDA, describes the XML format for representing a specific moment in time (often called a “timestamp”) in CDA documents.

That article notes that the granularity of a timestamp […]