| Interface | Description | 
|---|---|
| TreeNode | 
 The TreeNode represents a node in the program tree that can be used to construct a sub-tree rooted in a URCap program node. 
 | 
| Class | Description | 
|---|---|
| ProgramNodeVisitor | 
 The ProgramNodeVisitor is used in conjunction with the  
TreeNode.traverse(ProgramNodeVisitor) to visit all
 nodes in the sub-tree under the node on which TreeNode.traverse(com.ur.urcap.api.domain.program.structure.ProgramNodeVisitor) is called. | 
| URCapProgramNodeInterfaceVisitor<URCAP_PROGRAM_NODE_INTERFACE> | 
 The  
URCapProgramNodeInterfaceVisitor is used in conjunction with the TreeNode.traverse(ProgramNodeVisitor) to visit all
 nodes in the sub-tree under the node on which TreeNode.traverse(com.ur.urcap.api.domain.program.structure.ProgramNodeVisitor) is called. | 
| Exception | Description | 
|---|---|
| TreeStructureException | 
 This exception is thrown if the tree structure is illegal. 
 | 
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