The object CONTENT executes an SQL query on the database. The query is controlled by the property "select". Here "select" defines that we want all records from the column 0 (which is the column "NORMAL" in the backend), and that the result will be sorted according to the field "sorting". If the property pidInList is not set (like here) or has been removed, the query will be limited to the current page only. For example, if the page with ID 100 is referenced, the CONTENT object will only return records from the page with pid=100.