When do I use a fixed property?

First, what is a fixed property?  It’s an attribute of a resource that is permanently associated with that resource no matter where it gets used. For example: the make, model, barcode, and serial number of a piece of equipment are all fixed properties.

Fixed properties can also be handy for attributes you might not normally consider fixed, simply because that attribute becomes visible everywhere the resource goes (like a global variable). Once such situation where this is useful:

  1. If you prepare a stock solution of glucose, you would like that stock concentration value to be visible anywhere you use the solution. In that case, use the fixed-property variant of concentration instead of the non-fixed concentration variant.

Other than this situation (and others you might think up), it’s generally best to use a non-fixed property because non-fixed properties can handle multivalued data (like time series or repeated measurements) whereas fixed properties cannot. Thus non-fixed properties are the most versatile and accommodating for complex measurement data.

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