Hi! regarding the singleton property in webdynpro abap

Hi experts ,
Could anyone explain me in detail the property of singleton and wht r the conditions tht we should use wht will represents..
plz explain me in detail......rather than sending links plz do explain me in detail....
Regards,
Sana...

Cardinality : number of possible elements within the node.
Singleton property means whether or not all instances of this node get created at runtime or not.
Singleton property is mostly used to save memory & increase performance. we would go for singleton nodes in cases where UI needs only display from one-instance of data from my node.....
What happens when you set singleton property to YES for a node?? Assume you have context structure like
Context
     Vehicle( parent node )
       ( attribute veh-ID primary key for all types of vehicles, dealer, area )
          twowheeler( subnode of vehicle with cardinality-0..n singleton-NO)
                    ( attributes veh-ID, regno, model, color)
          fourwheeler( subnode of vehicle with cardinality-0..n singleton-YES)
                   ( attributes veh-ID, regno, model, color)
At design time you fill the data within this context. Now you have 100 entries under the subnode twowheeler & 90 entries under the subnode fourwheeler . You create UI elements to display the node twowheeler details in a View . At runtime when user selects the veh-ID and identifies that a twowheeler data needs to be fetched/displayed all the 100 entries for the twowheeler node get created in the background although you are displaying only the ONE corresponding to the veh-ID.
if Veh-ID selected coresponded to fourwheeler( singleton property -yes) only ONE row of the data from the fourwheeler entries would have been fetched and ONLY Once instance of the fourwheeler would be created by background process!!
thus saving memory & processing time.
Scenarios singleton-YES
If i were required to display details of only ONE vehicle based on the entered Veh-ID , i will make twowheeler & fourwheeler nodes singleton-YES.
Scenario singleton-NO
if i were required to show all the vehicles that belong to one particular Area.

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hi,
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[http://help.sap.com/saphelp_nw70/helpdata/EN/81/95384162316532e10000000a1550b0/frameset.htm]
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HI,
click on ur node and on the singleton proprty click F1. u will get the full detail.
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Hi! regarding the singleton property in webdynpro abap

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