Organization and Method of the Encyclopedia

The organizational method of Kashf al-Zunun reflects a deliberate effort to maximize utility as a reference work. Hajji Khalifa arranges his entries alphabetically by the first word of each title (in Arabic, where the title is Arabic) or by the transliterated first word (for Persian and Turkish titles). Within each alphabetical section, entries for book titles and entries for discipline names are interleaved, so that a user looking under the letter 'mim' will find both individual book titles beginning with that letter and the entry for the discipline of 'mantiq' (logic) with its associated sub-literature. This dual function, cataloguing both individual works and the intellectual disciplines (funun) as organized domains of knowledge, gives the Kashf al-Zunun a scope that transcends mere bibliography and amounts to a map of the entire Islamic intellectual world as Hajji Khalifa understood it.

A typical entry in Kashf al-Zunun follows a fairly consistent format. Hajji Khalifa first gives the full title of the work, then identifies the author with his name, scholarly titles, school affiliation, and death date. He then provides a brief description of the work's subject matter and method, noting whether it is an original composition, a commentary (sharh) on an earlier work, a super-commentary (hashiya) on a commentary, an abridgment (mukhtasar) of a longer work, or an expansion (mabsut) of a shorter one. When relevant, he mentions the work's reception and reputation in the scholarly tradition, noting if it is widely used in teaching (maqru') or merely known by name. He also lists major commentaries, abridgments, and translations of significant works, creating a genealogy of the commentary tradition that is itself an invaluable guide to how each text was studied and transmitted.

The sources Hajji Khalifa drew upon are themselves of considerable interest. He acknowledges his debt to earlier Islamic bibliographers, including Ibn Khallikan's Wafayat al-Ayan, Ibn al-Qifti's Ikhbar al-Ulama, and various tabaqat (scholarly generations) works. He also drew on the great Mamluk-era bio-bibliographical works, particularly the Durr al-Kamina of Ibn Hajar al-Asqalani and the works of al-Sakhawi. For Ottoman-era scholarship, he relied partly on his own direct knowledge and partly on information provided by colleagues and correspondents. He is candid about the limitations of his information: on numerous occasions he notes that he has heard of a work without having seen it, or that he has conflicting reports about its author or date. This intellectual honesty distinguishes him from some earlier Islamic bibliographers who were less forthcoming about the gaps in their knowledge.

The Kashf al-Zunun contains entries for approximately 14,500 titles, though the exact count varies depending on how sub-entries and cross-references are counted. This figure represents only a fraction of the Islamic literary production up to Hajji Khalifa's time, and he himself acknowledged that his work was necessarily incomplete. The selection principle appears to have been a combination of importance (major works received entries regardless of rarity), availability (works in accessible collections were more likely to be included), and scholarly reputation (works known to have generated commentary literature were given priority). This selection process inevitably reflected the Ottoman-Sunni perspective of the author, and works from traditions outside this mainstream, including Shi'i scholarship, sectarian literature, and some early rationalist philosophical works, are represented unevenly. Later supplements to the Kashf al-Zunun attempted to fill some of these gaps.