What features are generated for out-of-sentence positions?

[garfieldnate]

The documentation has the following example:

Input: Data

He        PRP  B-NP
reckons   VBZ  B-VP
the       DT   B-NP << CURRENT TOKEN
current   JJ   I-NP 
account   NN   I-NP

template	expanded feature
%x[0,0]	the
%x[0,1]	DT
%x[-1,0]	reckons
%x[-2,1]	PRP
%x[0,0]/%x[0,1]	the/DT
ABC%x[0,1]123	ABCDT123

The documentation does not state what features are generated for out-of-bounds positions. For example, what features are generated in the following situations?

He        PRP  B-NP << CURRENT TOKEN
reckons   VBZ  B-VP
the       DT   B-NP
current   JJ   I-NP 
account   NN   I-NP

template	expanded feature
%x[-1,0]	???

He        PRP  B-NP
reckons   VBZ  B-VP
the       DT   B-NP
current   JJ   I-NP 
account   NN   I-NP << CURRENT TOKEN

template	expanded feature
%x[1,0]	???

Or are these features perhaps not generated at all? I need to know if I should be adding my own BOS/EOS tokens.

[versusvoid]

To whom it may concern: Nope. BOS/EOS are added inside library. See FeatureIndex::getIndex@feature.cpp

[garfieldnate]

Thanks!