EQL Query Statement

Fields are designated by the _@_ symbol concatenated with the HL7 segment ID followed by the sequence number for the field separated by a period (see chapter 2 for definition of segment ID and sequence number). If the field is divided into components, the designation may be suffixed with _.nn,_ to identify a particular component (a suffix of _.3_ indicates the third component of the field); otherwise, the whole field is assumed. If the field is further divided into subcomponents, the designation is suffixed with _.nn.mm,_ which identifies the component and subcomponent requested by relative position.