You create the index terms for a document in PlanetPress using data selection objects. Each data selection object contains at most one index term, and the name of the index term is the name you define for it in the data selection object. A document can contain any number of index terms.
When PlanetPress Image executes a document, it gathers all the index terms you defined in the document and saves them in a PDI file. It creates one PDI file for each PDF file it generates. The PDI file bears the same name as the PDF file. For example if the PDF file is invoice.pdf, the corresponding PDI file is invoice.pdi. The PDI file is an ASCII file. Note that you can use the Digital action in a PlanetPress Suite Workflow Tool to produce a PDI file in XML format (rather than the native format PlanetPress Image generates). However PlanetPress Search reads only the native format produced by PlanetPress Image.
PlanetPress Search uses the information in the PDI files to build its search databases.