THE DOMAIN

Assassin's Creed II is a critically acclaimed action-adventure game developed by Ubisoft Montreal and released in 2009. The game is set in Renaissance-era Italy and follows the story of Ezio Auditore da Firenze, a young nobleman turned assassin, as he seeks revenge against those who have wronged his family.

Known for its immersive open-world environment, engaging storyline, and deep character development, the game cemented its place as one of the most popular and influential video games of all time, also thanks to the wide range of faithful depictions of cultural heritage items that permeate its whole narrative. In the game, the players are free to explore meticulous recreations of real-world locations such as the cities of Florence, Venice, and Rome, each of which is filled with accurate portrayals of historic landmarks and buildings, as well as a number of smaller towns and villages. The game also features a number of famous artworks, many of which can be found in the virtual galleries of the game's various palaces and museums, as well as many other lesser-known cultural heritage items, such as weapons and traditional dresses.

With such an extended quantity of cultural objects in it, the game presented itself as a perfect candidate for this Linked Open Data project, which aims to make use of LOD tools to describe in an interoperable and semantically meaningful way for 10 of these objects.

THE ITEMS

CONCEPTUAL MAP & E/R MODEL

The first step was to model our main topic and the 10 items we have chosen to represent the domain of study into a conceptual map, using natural language to create relations between each item and some of the most relevant descriptive characteristi cs we extracted from them, answering the questions of who, what, when and where.

We then translated the conceptual map into a more formal E/R model, abstracting the data and relationships from the previous map into more universal-fitting ones in order to graphically represent our domain employing a more general perspective.

CONCEPTUAL MAP
E/R MODEL

METADATA ANALYSIS

Coming back to the institutions and providers that held our items, we analysed which methods and metadata standards they used to describe these items. While for most of them the scouting for the standards utilised has been straightforward and painless, in some cases we were not able to directly access or retrieve the standards used, such as for the "Codice Atlantico (Codex Atlanticus), f. 860 recto" collected by Biblioteca Ambrosiana, the TV series "Assassin's Creed: Lineage" held by the online database IMDb and the statue "Perseus with the head of Medusa".
In these cases, we chose to use the standard we thought was most appropriate for the type of object and institution in question.

Item Type Provider Metadata standard used
by the provider
Metadata standard chosen
for the alignment
"Ritrovamento del cadavere di Jacopo de' Pazzi" Painting Catalogo Generale dei Beni Culturali ArCo ArCo
"Assassin’s Creed II: The Original Game Soundtrack" Soundtrack Musicbrainz.org MMD/XML-2.0 MMD/XML-2.0
Codex Atlanticus, f.860 recto Drawing Biblioteca Ambrosiana / Dublin Core
Assassin's Creed: Lineage TV Mini Series IMDb / schema.org
GamePro n.252 Magazine Belmont College Library MARC MARC21
Physical copy of Assassin's Creed II DVD University of Calgary MARC MARC21
"Assassin's Creed: Renaissance" Book Library of Congress MARC MARC21
Venetian Falchion Weapon The Metropolitan Museum of Art MET'S API MET'S API
Perseus with the head of Medusa Statue Bildindex der Kunst und Architektur / CIDOC-CRM
Palazzo Vecchio Building Catalogo Generale dei Beni Culturali ArCo ArCo

METADATA ALIGNMENT

After having identified the metadata elements and properties described by the institutions and the corresponding standards they used to do so, we have aligned those metadata elements and properties that are useful to address information related to people, places, dates, and subjects/concepts.

DublinCore ArCo CIDOC-CRM MMD/XML-2.0 schema.org MARC21 MET's API
Creator dc:creator a-cd:hasAuthor E21 - Person <artist><name></name></artist> schema:director 100$a - Personal Name /
Publisher dc:publisher / / / schema: productionCompany / creditLine

THEORETICAL & ENHANCED E/R MODEL

We moved further in our modeling effort by adding a new layer, that of data interpretation. This theoretical model is expressed in natural language and provides additional and more detailed information about the items, offering a more comprehensive understanding of the entities associated with the central topic.

Consequently, we also updated the original E/R model on the basis of the new theoretical model, enhancing its descriptive and informative capabilities by adding the new entities and relationships.

THEORETICAL MODEL
ENHANCED E/R MODEL

CONCEPTUAL MODEL

We then finally moved from the previously shown theoretical model to a more formal representation of our data, adopting an ontological approach. In this way, we constructed a conceptual model that incorporates established schemas and vocabularies to accurately portray our scenario in a cohesive manner.

ITEMS DESCRIPTION

With our modeling phase concluded, we revisited the items to depict them on the basis of the conceptual model that was developed. Each item is described in a statement codified in the form of a semantic triple, each row in the following table depicting a subject-predicate-object. The subjects and objects are expressed in natural language, whereas the predicates are conveyed through the ontologies identified in the preceding step.

The description of each of the items are stored in CSV files, downloadable by clicking on the icon on the upper left cell of each table.

Subject Predicate Object
(WHO) "Ritrovamento del cadavere di Jacopo de’ Pazzi" dcterms:creator Odoardo Borrani
(WHO) "Ritrovamento del cadavere di Jacopo de’ Pazzi" crm:P50_has_current_keeper Gli Uffizi
(WHERE) "Ritrovamento del cadavere di Jacopo de’ Pazzi" dc:coverage Florence
(WHEN) "Ritrovamento del cadavere di Jacopo de’ Pazzi" dcterms:date 1864
(WHAT) "Ritrovamento del cadavere di Jacopo de’ Pazzi" dcterms:title "Ritrovamento del cadavere di Jacopo de’ Pazzi"
(WHAT) "Ritrovamento del cadavere di Jacopo de’ Pazzi" crm:P2_has_type painting
(WHAT) "Ritrovamento del cadavere di Jacopo de’ Pazzi" a-dd:hasMaterialOrTechnique oil on canvas
(WHAT) "Ritrovamento del cadavere di Jacopo de’ Pazzi" crm:P43_has_dimension 145 x 121 cm
(WHAT) "Ritrovamento del cadavere di Jacopo de’ Pazzi" crm:P129_is_about Jacopo de' Pazzi

RDF PRODUCTION

The subsequent phase involved converting the previously-shown statements into RDF format, in our case using the Turtle syntax. Prior to composing the statements, we compiled a list of all the prefixes that we intended to use, and we then minted a set of URIs to identify the primary entities within the domain. We also employed owl:sameas to establish links between certain elements of the project and corresponding authority records, such as VIAF and GeoNames.

We used Felix Lohmeier's Turtle Web Editor to validate our Turtle file in conjunction with Anton Vasetenkov's Turtle Editor to count our total triples, which amounted to a total of 81 triples.

In our RDF production, we decided to expand some of the items by using other authority control, which is GettyAAT, to describe some of the items such as drawing techniques, etc.

We minted the following URIs:

RDF VISUALIZATION

Lastly, we visualized the RDF serialization using RDF Grapher.

THE TEAM

Ludi Yang
Evan Arnoldi
Grace Brown
Leonardo Zilli