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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 : *id002Įxplicit data typing is seldom seen in the majority of YAML documents since YAML autodetects simple types. References to the anchor work for all data types (see the ship-to reference in the example below).īelow is an example of a queue in an instrument sequencer in which two steps are reused repeatedly without being fully described each time. įor clarity, compactness, and avoiding data entry errors, YAML provides node anchors (using &) and references (using *). YAML structures enable storage of multiple documents within a single file, usage of references for repeated nodes, and usage of arbitrary nodes as keys. Two features that distinguish YAML from the capabilities of other data-serialization languages are structures and data typing. The second lists them by gender it is a key-value object containing two lists. The first example is a list of key-value objects, all people from the Smith family. Objects and lists are important components in yaml and can be mixed. It uses both Python-style indentation to indicate nesting, and a more compact format that uses for lists and - name : Mary Smith age : 27 - : # sequences as keys are supported - # People, by gender men : women : - Mary Smith - Susan Williams YAML targets many of the same communications applications as Extensible Markup Language (XML) but has a minimal syntax which intentionally differs from SGML.
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It is commonly used for configuration files and in applications where data is being stored or transmitted. Nodes should be labelled with an exclamation mark ( !) or double exclamation mark ( !!), followed by string which can be expanded into an URI or URL.YAML ( /ˈjæməl/ and YAH-ml) ( see § History and name) is a human-readable data-serialization language. YAML always requires colons and commas used as list separators followed by space with scalar values.
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Repeated nodes in each file are initially denoted by an ampersand ( &) and by an asterisk ( *) mark later. Multiple documents with single streams are separated with 3 hyphens (-). List members are enclosed in square brackets and separated by commas.Īssociative arrays are represented using colon ( : ) in the format of key value pair. List members are denoted by a leading hyphen ( -). Tabs are not included as indentation for YAML files. Indentation of whitespace is used to denote structure. The synopsis of YAML basic elements is given here: Comments in YAML begins with the ( #) character.Ĭomments must be separated from other tokens by whitespaces. The structure which follows all the basic conventions of YAML is shown below −
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Observe the example shown below −įolded text converts newlines to spaces and removes the leading whitespace. Inline format is delimited with comma and space and the items are enclosed in JSON. This block format uses hyphen+space to begin a new item in a specified list. The basic components of YAML are described below − Conventional Block Format YAML does not allow the use of tabs while creating YAML files spaces are allowed instead When you are creating a file in YAML, you should remember the following basic rules − Remember that YAML includes a human readable structured format. Now that you have an idea about YAML and its features, let us learn its basics with syntax and other operations.