A Line represents a tuple of values which is stored at a relational table . Two Lines represent the same tuple of values if they contain the same index and refer to the same context.
Returns the order preserving concatenation of the lines' values
Returns the table that contains this line .
Returns this Line's position at the table that is the context of this line .
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Link to context()
If this Line does contain a value for the given attribute the related value is returned. Otherwise an Exception is thrown.
Instances of Line are equals if they have equal indexes and Tables . Every type implementation should override its public boolean equlas(Object arg)
method with this one.