The purpose of this research is to investigate indexing issues that pertain to the development of digital libraries, including: the identification of sublanguage vocabulary; domain-specific indexing; and other indexing tools. Thesauri are needed for digital libraries in order to improve end-user access. To demonstrate the importance of thesauri to digital libraries, a mini-thesaurus will be constructed for the digital library domain. Specifically, the thesaurus will include terms that identify indexing methods and the infrastructure of digital libraries. The creation of the digital library thesaurus will reinforce the need for researchers to look at sublanguage vocabulary, and the need to use domain-specific indexing for all digital libraries. The terms will be extracted from abstracts and full text journal articles within three electronic research databases: "Library Literature,""Compendex," and from Internet resources. Three appendixes include a list of terms with definitions, the Digital Library Thesaurus hierarchical view, and the alphabetical view. (Contains 16 references.) (AEF)