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- design-time substitution: The variable is used in a block that is added to a library. When the block is used, that is, it is dragged from the library listing onto the visualization page, then the user is prompted to provide specific values for the used block variables. This is useful e.g. to prepare a lighting control block in the library. When the block is instantiated on a page then specific parts of ItemIDs are replaced while other properties remain constant.
- run-time substitution: The variable is used in a visualization element. When the element is displayed the variable is substituted by it its specific value. Variables of this kind can be defined for layers, pages, groups and other visual elements.
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