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    Path Expressions
    • 14 Jun 2020
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    Contents

    Path Expressions

    • Updated on 14 Jun 2020
    • 1 Minute to read
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    Article summary

    Whenever you specify a message part's path property, you are telling it the location of a data element within the HL7 message. However, sometimes the mapping requires the combination of more than one data element. In order to accommodate this scenario, Dr. Know supports path expressions.

    A path expression is simply any expression with one or more paths specified, each contained within curly braces ({ }).

    Examples

    Here are a few examples that will demonstrate this easy, but powerful ability. Combined with value mappings (discussed later), path expressions can help you easily accommodate even the trickiest of communications mappings.

    {PID.3.1}, {PID.3.2} {PID.3.3}
    • This expression could be used to represent the full name of a patient
    • LastName, FirstName MI
    {OBR2.1}-{OBR2.2.1.2}
    • This expression could be used as a mapping of two data elements found in the same ORB segment
    {MSH.3.1}^{MSH.3.2}
    • This expression could be used to mimic a sub-section of the raw data packet
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