In Appian, the data type of a local variable is inferred from the value it is set to. Unlike some other programming languages where the data type must be explicitly declared, Appian determines the data type automatically based on the initial value assigned to the local variable. Local variables in Appian are quite flexible and can store various types of data, including complex data types, not just primitive ones.
Reference: Appian Documentation - Local Variables

Given that ri!name is defined as " Maria " and ri!directory contains two a!map() structures, one of which includes the name " Maria, " the expression wherecontains(ri!name, index(ri!directory, " name " )) will evaluate as follows: The index() function will return a list of values from ri!directory for the key " name, " which will be { " Maria " , " Steven " } . The wherecontains() function will then check where " Maria " is found within this list. Since " Maria " is the first element, the function will return a list of indices where " Maria " is found, in this case, {1} . Appian lists are 1-indexed, so the first position is represented by 1, not 0.
References: Appian Expression Language Documentation - Functions

Appian's data sync feature supports synchronization from three primary data sources: Salesforce, Process Models, and Databases. This allows for the creation of record types that can efficiently access and manipulate data from these sources, leveraging Appian's capabilities to provide real-time insights and interactions with external systems and internal processes.
Reference:
Appian Documentation: Creating Record Types