The objects on one IpePage can belong to any number of layers. Layers are orthogonal to the back-to-front ordering of objects, so a "layer" is just another attribute of the object.
Layers have several attributes. They may be editable or locked. Objects can be selected and modified only if their layer is editable. A layer may be visible, invisible, or dimmed. A layer may have snapping on or off---objects will behave magnetically only if their layer has snapping on.
The PDF output generated for an IpePage depends on its presentation sequence. Each item in the presentation sequence may list a number of layers to be displayed at that stage. Multiple presentation items may show different subsets of layers.
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Construct with name. Default attributes.
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Construct from a single XML tag.
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Write a single XML tag describing this layer.
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Return name.
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Set name.
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Is visible?
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Is dimmed?
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Is locked?
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Is snapping enabled?
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Set visibility.
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Set dimming.
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Set locking.
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Set snapping.
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