Property Table

The SEDRIS Data Representation Model APPENDIX A - Classes Property Table

Class Name: Property Table

This DRM class is concrete and has no subclasses.

An instance of this DRM class is a <Data Table> instance containing no location information, and therefore has no spatial <Axis> components.

Externally Controlled Table-Based Animation
See <Scale Control Link>, example 1.
Cyclic Table-Based Animation
See <Translation Control Link>, example 2.
Function-Driven Table-Based Animation
See <Property Table Reference Control Link>, example 1.

Why is a <Property Table> instance permitted to aggregate other <Property Table> instances?

This mechanism allows a <Property Table> cell data element to specify an index into the set of ordered <Property Table> components, so that any component <Property Table> can be "re-used" by many data cells. See <<Index Codes within Tables>> for further details.

Why isn't a <Property Table> instance allowed to aggregate <Property Grid> instances?

An object referencing a <Property Grid> shall specify a <Location> for the <Property Grid> origin, and a <Property Table> has no location information.

Why is a <Property Table> instance permitted to aggregate <Property Table Reference> instances?

This mechanism allows a <Property Table> cell data element to specify an index into the set of ordered <Property Table Reference> components, so that any component <Property Table Reference> can be "re-used" by many data cells, therefore referring to "slices" of other <Property Table> instances without replicating the information. See <<Index Codes within Tables>> for further details.

Can values from a <Property Table> be used to drive <Control Link> instances?

Yes; this is possible in the following way.

Store the values in cells of the <Property Table> such that their <Table Property Description>'s meaning is appropriate for the target <Control Link> that is to be driven.
Where the values are to be referenced in the controlling <Expression> of the target <Control Link>, place a <Predefined Function> SE_PREDEF_FUNC_TABLE_VALUE instance, which in turn contains an appropriate <Property Table Reference> as an argument, referencing the values in the <Property Table>.

The <Predefined Function> will thereby return the value referenced from the <Property Table> as the value that drives the target <Control Link>.

If desired, the <Property Table Reference> can itself be controlled using a <Property Table Reference Control Link>, allowing different values to be referenced from the <Property Table> based on a controlling <Expression>.

See Part 4, Volume 5 Control Link Technical Guide of the SEDRIS Documentation Set for further details, as well as the examples shown here.

This class has no inherited field elements.

 This indicates the kind of information represented by the
 <Data Table>, such as terrain elevation or
 water characteristics.

 This provides a mechanism for the cells of the aggregate
 <Property Table> to reference 'slices' of other
 <Property Table> instances.

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Last updated: July 16, 2004