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It is proposed to use the same convention currently used in SLIC/lcsim/CompactGeometry. This consists of a string encoded thus:
<fieldDesc>\[,<fieldDesc>...\]unmigrated-wiki-markup Wiki Markup
fieldDesc = name:\[start\]:\[-\]length
For example
layer:7,system:-3,barrel:3,theta:32:11,phi:11
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