Newick format is an actively used text data format created in 1986.

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Example code from the web:

(A:0.1,B:0.2,(C:0.3,D:0.4):0.5);

Example code from Wikipedia:

Tree → RootLeaf ";" | RootInternal ";" | Branch ";"
   RootLeaf → Name | "(" Branch ")" Name
   RootInternal → "(" Branch "," BranchSet ")" Name
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Last updated February 11th, 2019