# Personalization in Digital Ecomuseums: The Case of Pros-Eleusis
## 5 User and Content Model
### Point of Interest Model  
The user model characteristics were matched to corresponding POI characteristics, designed to support the need for recommendations according to the user characteristics. This resulted in a content model for the POIs with eight relevant characteristics (Table 3). These characteristics are defined as follows:  
**Location**: The POI geographical location in GPS coordinates on a real-life map. **Minimum time needed to visit the POI**: The minimum duration is the time needed to listen to the content for this POI. **Opening hours**: This field is optional. It is filled in if applicable for the specific POI. Ticket cost: This field is optional. It is filled in if we have relevant information for the specific POI. **Possibility of meeting local residents**: Filled in if applicable for the specific POI. **Accessibility**: Following a simple model for accessibility, the POI is characterized as accessible if it is possible for visitors with constrained mobility to comfortably visit either as an outdoor or indoor space. \begin{table}
\begin{tabular}{c c c c c} \hline \hline  & **Characteristic** & **Type** & **Value** & **Constraint** & **Elicitation** \\ \hline \multirow{4}{*}{1} & Time available for the & & & & Explicit: The user is \\  & visit & Visit context & Value in minutes & SOFT & presented with a dropdown \\  & & visit & & menu with time durations & (30, 60, 90 min, etc.) \\  & Maximum cost that & & Maximum cost in & Explicit: User is presented \\  & visitor is willing to pay & Visit context & EUR & SOFT & with a dropdown list with different cost values in EUR \\  & for entry & & & & different cost values in EUR \\  & Preference for city & & & & \\  & highlights & Preferences & Yes/No & SOFT & Explicit \\  & & & Options available: & & \\  & & & I can go anywhere, & & \\  & & & I have a baby in a & & \\
4 & Accessibility & User mobility & & & \\  & & & & & \\  & & & & & \\  & & & & & \\
5 & Meeting with locals & Visit context & Yes/No & SOFT & Explicit \\  & & & List of POIs the & & Implicit: Recorded \\
6 & Visited POIs & Visit context & user has already & HARD & automatically by the system \\  & & & visited & & in the user profile \\ \hline \hline \end{tabular}
\end{table} 
Table 2: User model. \begin{table}
\begin{tabular}{c c} \hline \hline
**Variable** & **Value** \\ \hline Location & Latitude, longitude \\ Minimum time needed to visit the POI & Time duration \\ Opening hours & Weekly schedule of opening hours if applicable \\ Ticket cost & Price in EUR \\ Possibility to meet local residents & Boolean (yes/no) \\  & & 2 options: Accessible to all \\ Accessibility & Not accessible \\ Preference for highlights & Boolean (yes/no) \\ Tags & Set of labels \\ \hline \hline \end{tabular}
\end{table} 
Table 3: POI characteristics to support recommendations. **Highlights**: This characteristic denotes if the POI is considered a highlight, a \"must-see\", of the city for visitors. **Tags**: A set of labels that represent concepts relevant to one or more POIs. They were created as a way to define content similarities between the POIs that could later be used by the personalization system during the similarity calculation process. The process of creating these tags was iterative. We asked three history experts with knowledge of the city to read texts that described the points of interest and annotate them using either concepts from the text or general concepts that they considered relevant. We gradually collected these concepts in a single vocabulary. At first, this vocabulary was a simple list of labels, but we realized that a hierarchical structure would make it easier to read and comprehend. To decide how to organize the terms, we studied several controlled vocabularies that are widely used in the field of cultural heritage. We devised six general categories: time, society/life in society, natural environment, home and family life, people, professional life, and abstract ideas and concepts.