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You can also add a reference to a parameter.  A proper reference is important, as users of the knowledgebase may not be certain of the exact meaning of the parameter. Please also read Documentation of knowledge for more details. Scroll down to the Reference row and enter Length "length of the ship".

 Figure 4   In the Frame Viewer, Assign a dimension and reference can be assigned to the parameter Image Removed Assign a dimension and a reference to the other parameters B and T, just as described above. Of course, the breadth and depth of the ship are defined in meters.

Now only the last requirement for valid parameters has yet to be fulfilled:

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a way to be determined

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(input from the user or defined by a relation).

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This qualification can be provided in the Slots & the Properties  windowwindow.

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Select the parameter 

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Lpp. In the

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Properties window, scroll down to the Determined by row. Change the value to VR: User only, as the parameter

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Lpp is input (instead of defined by a relation)

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.

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Figure 5    Let Quaestor know how a parameter should be determined     

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Notice that now, the status of LPP the Lpp parameter has changed to

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to show that Quaestor knows enough about this parameter to use it in a computational model.

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Now make sure that B and T are determined by VR (Value Requested):User only too.

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Note that above you have explicitly added Lpp, B and T as parameters to the knowledge base.  
You are also able to implicitly add parameter by creating relations that contain new parameters. Quaestor will automatically add these new parameters to your knowledge base (so, implicitly). You will see this nextencounter this in the following section.

4    Creating relations

In order to define the loading capacity of the ship, it’s important to know the kind of water (Salt or Fresh) the ship will sail in. Therefore, we will add some relation and constraints, and make sure the user can select the watertype.

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