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I want to reuse a hash in YAML:
Defaults: &defaults Company: Foo Item: 123 Computer: *defaults Price: 3000 However, this generates an error.
Is the only way to anchor each field value separately like this?
Defaults: Company: &company Foo Item: &item 123 Computer: Company: *company Item: *item Price: 3000 
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The “<<” merge key is used to indicate that all the keys of one or more specified maps should be inserted into the current map. If the value associated with the key is a single mapping node, each of its key/value pairs is inserted into the current mapping, unless the key already exists in it.
YAML does not support block or multi-line comments.
YAML does not natively support variable placeholders. Anchors and Aliases almost provide the desired functionality, but these do not work as variable placeholders that can be inserted into arbitrary regions throughout the YAML text. They must be placed as separate YAML nodes.
Try reusing a full group by importing it:
Defaults: &defaults Company: foo Item: 123 Computer: <<: *defaults Price: 3000 Documentation: http://yaml.org/type/merge.html
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# sequencer protocols for Laser eye surgery --- - step: &id001 # defines anchor label &id001 instrument: Lasik 2000 pulseEnergy: 5.4 pulseDuration: 12 repetition: 1000 spotSize: 1mm - step: &id002 instrument: Lasik 2000 pulseEnergy: 5.0 pulseDuration: 10 repetition: 500 spotSize: 2mm - step: *id001 # refers to the first step (with anchor &id001) - step: *id002 # refers to the second step - step: *id001 - step: *id002 sample from wikipedia
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