Lister Parameters Lister Parameters When you invoke a method to specify sources, you specify Lister parameters. You specify the same Lister parameters for the AddListToBatch()Opens in a new tab Lister instance method (for large batch loads of sources) and the ProcessList()Opens in a new tab Loader instance method (for adding a small number of sources to an existing batch of sources).There are four Lister parameters that cumulatively define which sources are to be listed for NLP indexing: Path: the location where the sources are located, specified as a string. This parameter is mandatory. Extensions: one or more file extension suffixes that identify which sources are to be listed. Specified as an InterSystems IRIS list data structure, each element of which is a string (refer to $LISTBUILD for details on InterSystems IRIS list data structures). By default the Lister selects all files in the Path directory that contain data, regardless of their file extension suffix. This includes files with no file extension suffix or with a file extension suffix indicating a non-text (such as .jpg). Empty files are not selected. Directories are not selected. When an extension suffix parameter is specified, the Lister selects only those files in the Path directory with that file extension suffix (or with no file extension suffix) that contain data. Recursive: a boolean value that specifies whether to search subdirectories of the path for sources. If selected, multiple levels of subdirectories are searched for sources. 1 = include subdirectories. 0 = do not include subdirectories. The default is 0. Filter: a string specifying a filter used to limit which sources are to be listed for NLP indexing. For example, a user-designed filter could limit the Lister to only those files that have a specified substring in their file names. The default is to use no filter. (Note that this use of the word “filter” is completely separate from the filters in the %iKnow.Filters class that are used to include or exclude already-indexed sources supplied to an NLP query.)
