What are the differences between Existing Attributes and newly Created Attributes?
Could you be a bit more specific?? Are you referring to attributes that have a value and those that do not, or user-defined attributes??
I suspect the latter, so here goes. Existing attributes are in the tables in the schema, and the actual database table/attribute names (such as ITEM.SUBCLASS) are shown in the ATTRIBUTE column in the Classes Report and when viewing the schema classes in the Java client. When you create a user-defined attribute, it does not alter the structure of any tables in the database, but instead creates the necessary configuration records in NODETABLE/PROPERTYTABLE, and then stores data values in the AGILE_FLEX table using the ID of the newly created attribute. In AGILE_FLEX, it just looks like another attribute, very similar to how multi-text attributes are stored.