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e.g. 'DataTypeCode eq 1' to only receive action related events for actions that are of data type 1 (Audiogram actions). Logical operators can be used to specify multiple conditions e.g. 'DataTypeCode eq 1 or DataTypeCode eq 15' to only receive action related events for actions that are of data type 1 (Audiogram actions) and 15 (Admittance left). It's possible to use the 'any' keyword after the operator to specify a list of values that the property must match e.g. the former expression can be writen as 'DataTypeCode eq any (1,15)'. The list of values must be comma separated and enclosed in parenthesis.
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