[Biopython-dev] [Wg-phyloinformatics] GSoC Weekly Update 9: PhyloXML for Biopython

[Hilmar Lapp]

On Jul 21, 2009, at 1:29 PM, Eric Talevich wrote:

> Element Clade is used in a recursive manner to describe the topology  
> of a phylogenetic tree.


That's OK I guess on the topological level - a subtree of a clade is  
also a clade. I.e., the clade formed a node A and all its descendants  
is contained within the clade formed by the parent of A and all of the  
parent's descendants.

But referring to or identifying a clade must be referring to an entire  
group of nodes, not only one. So attaching something to the clade  
semantically has to attach it to all nodes in the clade.

	-hilmar

-- 
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: Hilmar Lapp  -:-  Durham, NC  -:-  hlapp at gmx dot net :
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