ENVO:wood and secondary xylen

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PO has:

PO:0005848 'secondary xylem'
def: "A portion of xylem (PO:0005352) tissue that develops from a vascular 
cambium (PO:0005598)." [ISBN:0471245194]
comment: Secondary xylem develops as part of secondary growth (GO:0080117). 
Secondary xylem is the wood of gymnosperm and dicot angiosperm trees, shrubs, 
and lianas. May be organized into axial (PO:0025410) and ray (PO:0025411) 
systems. Secondary xylem is often part of a shoot axis (PO:0025029) or a root 
(PO:0009005) but may occur in other organs. Some monocots have a primary 
thickening meristem (PO:0005039), located near the shoot apical meristem 
(PO:0020148), that gives the appearance of secondary growth and may produce 
lignified tissue that appears woody but is not composed of secondary xylem. 
Tracheary elements in secondary xylem (PO:0000290) have lignified cell walls 
with secondary thickening and are dead at maturity.
is_a: PO:0005352  ! xylem
relationship: develops_from PO:0005598 ! vascular cambium

How should this related to ENVO:wood?

The ENVO class has subclasses such as 'treated wood'. The PO class refers to a 
substance that is part of a (possibly still living?) plant.

Original issue reported on code.google.com by cmung...@gmail.com on 5 Oct 2014 at 10:11

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It looks much the same. I don't think there's the implication that it's still 
living, just that it developed from a vascular cambium. The treated wood can be 
expressed as the output of some treatment process, perhaps? 

Original comment by p.buttig...@gmail.com on 9 Dec 2014 at 11:12

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