# Envisaging a European Digital Building Renovation Logbook: Proposal of a Data Model
## 2 Materials and Methods
### Identification of Model Entities
\begin{table}
\begin{tabular}{c c c c} \hline
**Category** & **Entity** & **Entity Priority** & **Justification Based on Scientific Literature** \\ \hline Core/Root & City & Required & Enables automated characterisation of outdoor environmental conditions impacting the building [27] \\ \cline{2-3}  & Building & Required & Facilitates characterisation of the building or portion and stores its key documentation [31] \\ \hline General information & BuildingAddress & Desirable & Essential for the complete identification of the building or unit [32] \\ \cline{2-3}  & BuildingUnitAddress & Desirable & building or unit [32] \\ \cline{2-3}  & BuildingType & Required & Necessary to complete the building characterisation [31] \\ \cline{2-3}  & Accessibility & Required & Accessibility is a key focus of renovation efforts [33] \\ \hline Administrative information & BuildingOwner & Desirable & Key for fostering stakeholder engagement [34; 35] \\ \cline{2-3}  & BuildingOwnerAddress & Desirable & \\ \hline Financial information & FinancialInformation & Desirable & Important for analysing changes in valuation and service costs pre- and post-renovation [36] \\ \hline  & Facade & Required & \\ \cline{2-3}  & Roof & Required & \\ \cline{2-3}  & Floor & Required & Essential for characterising the current building envelope, planning intervention strategies [37], and storing useful information for conducting performance and LCA simulations [38] \\ \cline{2-3}  & Construction and materials information & Doors & Required \\ \cline{2-3}  & ThormalBridges & Required & \\ \cline{2-3}  & EnvelopeLayers & Required & \\ \cline{2-3}  & Materials & Required & \\ \hline  & DHWSystem & Required & Key for characterising the current building systems, planning and comparing renovation strategies [37], and storing useful information for conducting performance and LCA simulations [39] \\ \hline Technical systems & HeatingSystem & Required & Key for characterising the current building systems, planning and comparing renovation strategies [37], and storing useful information for conducting performance and LCA simulations [39] \\ \cline{2-3}  & MechanicalVentilation & Required & Essential for building characterisation and identifying improvement areas to enhance building energy performance and reduce water and non-renewable energy consumption [40] \\ \cline{2-3}  & LightingSystem & Desirable & \\ \hline  & DistrictHeatingCooling & Required & \\ \cline{2-3}  & EnergyCommunity & Required & Essential for building characterisation and identifying improvement areas to enhance building energy performance and reduce water and non-renewable energy consumption [40] \\ \cline{2-3}  & Energyand water performance, renewable energy, SRI information & \\ \cline{2-3}  & Energyand water performance, renewable energy, SRI information & \\ \cline{2-3}  & Energyand water performance, renewable energy, SRI information & \\ \hline  & & Incorporating the SRI enables assessing renovation impacts on smart readiness, guiding strategic prioritisation of technology upgrades aligned with building goals for impactful renovations [41; 42] \\ \end{tabular}
\end{table} 
Table 1: Identification, categorisation, prioritisation, and justification of the model entities. When moving towards the logical model stage, entities were formalised into tables (Figure 2), where \"A\" denotes the entity's name, \"B\" signifies its primary key, and attributes from \"C\" to \"Z\" encompass its various characteristics. Additionally, \"X\" and \"X\" symbolise the entity's relationships with others, alongside delineating the types of relationships involved.