Search within the *Decretum Gratiani* allows users to explore the sections of the canonical corpus in a targeted way by applying progressive hierarchical filters. The system enables users to search for keywords or expressions, gradually narrowing the search scope down to individual chapters or paragraphs.

After selecting *Decretum Gratiani* as the reference corpus and starting a search, the results matching the entered criteria are displayed. Each result includes:

• A clickable title, which allows access to the detail page;
• A text excerpt, in which the keywords are highlighted;
• The total number of results found.

The layout is simple and uniform, ensuring clear and immediate readability.

Search and Results

The search system for the *Decretum Gratiani* provides a set of progressive filters that dynamically expand based on the user’s selections. The goal is to enable structured navigation within the canonical corpus, allowing users to quickly isolate sections of interest.

Before selecting the *Pars*, the following general filtering fields are always available:

• Free text search → a free text field that allows keyword or specific string searches within the corpus;
• Author → allows the search to be restricted to a specific author (if available);
• From / To → allows users to define a reference chronological range.

After these initial fields, the main PARS filter is presented, which determines the structure of the subsequent fields.

After selecting PARS I, the system displays the following filters:

• Distinctio
• Dictum
• Capitulum

This configuration allows detailed exploration of the initial part of the *Decretum Gratiani*, organized by distinctions and chapters.

PARS II presents a different structure, articulated into more complex thematic levels. The displayed filters are:

• Causa
• Quaestio
• Distinctio
• Dictum
• Capitulum

This organization reflects the subdivision of the second part of the corpus, which follows the logic of *causae* and *quaestiones*, typical of Gratian’s casuistic approach.

PARS III follows the same structure as PARS I, with the following filters:

• Distinctio
• Dictum
• Capitulum

Each selection dynamically determines the subsequent available fields. Once the search criteria are set and the search is launched using the Search button, the corresponding results are displayed. If no results match the specified criteria, the system displays the message “No results found”.

By clicking on a result, the user accesses the detail page, which displays:

• The title and the full text of the selected excerpt;
• An introductory message guiding interaction with the text

(“Select some text to add notes or suggest corrections”);

• The Notes and Export buttons, positioned in the upper right section.

From this page, users can read the full text, add annotations, or export the data.

For further details on the functionality of the Notes button, please refer to the section *Notes and annotations management*.

For further details on the functionality of the Export button, please refer to the section *Export button*.

The page maintains the same visual and functional logic as the homepage:

• Top tabs for switching between corpora;
• Session bar with the Logout button;
• Institutional footer with project references, support links, and official logos.