JSDO memory stores table records as record objects according to the schema of the Data Object resource that is mapped to the JSDO. If the data model is for a single table, JSDO memory can contain only record objects for the specified table.

If the data model is for a multi-table resource (such as an OpenEdge ProDataSet), JSDO memory can contain record objects for all the tables defined in the multi-table resource. By default, record objects for a multi-table resource are maintained in JSDO memory according to any data relations defined between the tables. This means, for example, that when a JSDO method finds a record object of a parent table, if a method is then called to search through the record objects of a table that is a child of that parent, the search will find only record objects that are related to the record object found in the parent; if new record objects are added to the same child table, they are added with key fields set implicitly in relation to the parent record object. The JSDO also supports a boolean run-time option (the useRelationships property) that toggles between honoring these data relations and ignoring them when you access table data in JSDO memory.