# description
The kind of operation to perform as a part of a property based filter.

# concept[].definition
The specified property of the code equals the provided value.

# concept[].extension[].valueString
The definition of is-a is that all the properties of the value are true for the specified property of the code, which means that a code has an is-a relationship with itself. To exclude the root code, use descendent-of

# concept[].definition
Includes all concept ids that have a transitive is-a relationship with the concept Id provided as the value, including the provided concept itself (include descendant codes and self).

# concept[].extension[].valueString
The definition of is-a is that all the properties of the value are true for the specified property of the code. 

Spelling note: "descendant" is a more correct spelling, but the spelling "descendent" is maintained in the code for backwards compatibility reasons

# concept[].definition
Includes all concept ids that have a transitive is-a relationship with the concept Id provided as the value, excluding the provided concept itself i.e. include descendant codes only).

# concept[].definition
The specified property of the code does not have an is-a relationship with the provided value.

# concept[].definition
The specified property of the code  matches the regex specified in the provided value.

# concept[].definition
The specified property of the code is in the set of codes or concepts specified in the provided value (comma separated list).

# concept[].definition
The specified property of the code is not in the set of codes or concepts specified in the provided value (comma separated list).

# concept[].extension[].valueString
The definition of is-a is that all the properties of the value are true for the specified property of the code, which means that a code has an is-a relationship with itself. To exclude the root code, add it explicitly to as an exclude

# concept[].definition
Includes all concept ids that have a transitive is-a relationship from the concept Id provided as the value, including the provided concept itself (i.e. include ancestor codes and self).

# concept[].definition
The specified property of the code has at least one value (if the specified value is true; if the specified value is false, then matches when the specified property of the code has no values).