I can speak for the Tuscany C++ implementation. In this version the data factory keeps a record of all types and their properties. When the first data object is created, the metadata becomes read-only, and properties can no longer be added to types. The only way to add dynamic content to a type is to declare it as an open type - in which case you can add any properties you like, but they apply only to the instance which you are working with, and are not known to the metadata. getInstanceProperties gives you the list of all metadata properties plus all the open ones, whilst getType().getProperties() gives only the properties defined on the metadata.
regards, Ed. On 26/06/06, sensystems <[EMAIL PROTECTED]> wrote:
Hello I have a conceptual question with SDO, may be you can help me to figure this out: As the dynamic DataObject will always use reflection APIs The questions are: 1) Are there APIs which allow you to change a Type? 2) If so, what's the synchronization between the type and instance my requirements says this: a) I should provide the aplication with an initial base metamodel. b) the users (using the gui)can make instances of that metamodel c) the users can add propertyes to any type d) the users can only remove the properties they added e) if a property is added to a type, the current instances should have that property set to the default value (or may be unset) d) if a property is removed from a type all the instances should have that property removed Thank you very much for your responses. sensystems. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
