## 5 Proposal for an Asset Concealment Ontology
### Kinship and Friendship Ontologies  
When discussing asset concealment, relationships between people, especially kinship and friendship relationships, are an essential concept for analyzing the problem. An extensive search for related works was carried out to identify some of the main ontologies related to these domains. In this context, we will analyze a domain ontology related to genealogy, including OntoUML [127], the Family History Knowledge Base [128], the Kinship Ontology [129], and the Friend of a Friend (FOAF) ontology [130]. A domain ontology about genealogy in OntoUML is based on the Unified Foundational Ontology (UML) class diagram and differentiates categories of classes according to \begin{table}
\begin{tabular}{p{142.3 pt} p{142.3 pt}} \hline \hline
**Category** & **Description** \\ \hline Activity & The domain of activity \\ Agent & Financial institution (customer’s bank, intermediary bank) \\ Agent:CreditorAgent & Financial institution associated with the creditor customer \\ Agent:DebtorAgent & Financial institution associated with the debtor customer \\ Agent:IntermediaryAgent & Financial institution acting as an intermediary between two financial institutions \\ Customer & Creditor and debtor customer (not a financial institution) \\ Customer:Organization & Entity engaged in selling goods and services \\ Customer:Organization:Association & Organizations, associations, and NGOs; not used due to legal ambiguity \\ Customer:Organization:Company & Public or private company \\ Customer:Person & Individual \\ Transaction & Money transfer between two customers \\ \hline \hline \end{tabular}
\end{table} 
Table 12: Onti-FIC concepts [126]. the taxonomy of types in UML [127]. The domain ontology about genealogy in OntoUML tries to define relationships between biological ancestors. \"It is based on the stance that human beings (Person) are products of instantaneous Conception events, which occur when a human male (MaleProcreator) sperm unites with a human female (FemaleProcreator) oocyte egg\" [127]. The whole concepts found in the ontology are presented in Figure 5.  
The Family History Knowledge Base (FHKB) is based on ten core classes: DomainEntity, with three subclasses Person, Sex, and Partnership; Sex, with Male and Female as subclasses; Man and Woman, which are defined as a Person that has a has a Sex property to relate this with some Male or Female classes; and Partnership with its subclass Marriage [128]. FHKB also uses properties to describe required information about an individual related to their parentage and siblings. [PERSON]'s work proposes an Ontology for Formal Models of Kinship (T-KINSHIP) using a first-order ontology that captures anthropological concepts of kinship. Her approach differs from existing work because \"instead of focusing on which kinship relationship types should be considered as roles, she has taken the existing anthropological kinship terms and have axiomatized them as binary relations within the ontology\" [129]. According to this work, to determine a relationship between two people in the graph, finding a path between these two entities is necessary. In this way, the definition of all kinship relations begins with the parent/child relation and all other relations are defined through composition. Friend of a Friend ontology is a project that aims to link people and information using the Web. It tries to integrate social networks of human collaboration, such as friendship and association [130]. FOAF allows the creation of social networks, which can be used to define relationships between customers, bank personnel, and roles and hierarchy within the organizations [131]. Its vocabulary specification defines important classes, such as Group, which represents a collection of individual agents; Person, which means people and is a subclass of Agent; and Organization, which corresponds to social institutions such as companies, societies, etc., and is also a subclass of Agent [130]. This ontology's two most important relationships are \"knows\" and \"member\".