Knowledge Base

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====== Search in the Liber Extra ======

===== Introduction =====
Within the *Corpus Iuris Canonici*, the **Liber Extra** section represents one of the main reference corpora for the consultation of papal decretals.  
The platform allows users to perform textual searches, apply dynamic filters, and view results enriched with comments and glosses.  
The general functioning mirrors that of the *Decretum Gratiani*, but includes additional features specifically dedicated to the **Glossa Ordinaria**.
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===== Access and filter setup =====
From the homepage, by selecting **Liber Extra** as the reference corpus, the relevant search fields are activated.  
The user can:

  * Enter a keyword in the **Free text search** field;
  * Restrict the search to a specific book using the **Select Book** menu;
  * Start the search using **Search** or reset the fields using **Reset**.

Filters are loaded dynamically and expand according to the selection of structural levels (e.g. book → chapter → paragraph).

{{gnorm:Liber_Filters.png?500|Liber Extra Filters}}
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===== Results visualization =====
Once the search is launched, the relevant results are displayed.  
Each entry contains:

  * A clickable title to open the text detail;
  * A content excerpt with highlighted keywords;
  * The total number of results found.

If no matches are found, the message **“No results found”** is displayed.

{{gnorm:gnorm_results_view.png?500|Gnorm Results}}
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===== Detail page =====
By clicking on a result, the user accesses the text detail page, which displays:

  * The title and the author (for example, *GREGORIUS*);
  * The full body of the selected text;
  * The **Notes** and **Export** buttons in the upper right corner;
  * A guiding message for interacting with the text:  
    “Select some text to add notes, view cross-references or suggest corrections.”

From this page, users can read, annotate, or export the content in the same way as with other corpora.


{{gnorm:gnorm_detail.png?500|Gnorm Details}}
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===== Glossa Ordinaria visualization =====
A distinctive feature of the **Liber Extra** is the ability to consult the **Glossa Ordinaria**, an apparatus of canonical commentaries presented in parallel with the main text.  
When the user clicks on a portion of text highlighted in blue, a right-hand sidebar appears containing:

  * The title of the gloss (e.g. *Cupiditas*);
  * The associated explanatory or interpretative text;
  * Any references to related sections or chapters.

This mode enables parallel navigation between the normative text and its commentary, facilitating philological analysis and comparison.


{{gnorm:gnorm_glossa_ordinaria.png?500|Glossa Ordinaria}}
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===== Notes management =====
For further details on the functionality of the **Notes** button, please refer to the section *Notes and annotations management*.
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===== Data export =====
For further details on the functionality of the **Export** button, please refer to the section *Export button*.
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===== Navigation and visual consistency =====
The **Liber Extra** section maintains the same graphical and functional consistency as the rest of the platform:

  * Top tabs for quickly switching between corpora (*Corpus Iuris Canonici* / *Babylonian Talmud*);
  * Session button (**Access / Logout**);
  * Institutional footer with links to *About*, *Resources*, *Support*, *FAQ*, *Forum*, *Helpdesk*, and the official ITSERR project logos.