If the file exists, it will be appended to, otherwise it is created as new. The name of the database server to access for keyword database information. The name of the keyword database to access for keyword information. The name of the database server to access for reading the DADS catalog. The name of the DADS database to access for reading the DADS catalog.
Rule classes are currently three-character strings that identify lines in the keyword rules file.
For example, STS is the rule class that defines rules used to set STIS calibration switch settings. Any additional keywords upon which the needed keyword depends must also be loaded from the keyword source, so space is allocated for them. Each of these added keywords is then also traced, so that when the tracing is complete, a self-contained list of rules is identified that will be used to set the values for the requested keywords. All other rules that happen to be loaded will at that point be pruned off, since they are not needed. The set of resulting rules is driven by the list of keyword values that the user wants to recompute.