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.. Copyright (C) 2019 IBM.
Expression
==========
TOSCA provides for a set of functions to reference elements within the template or to retrieve runtime values.
Below is a list of supported expressions
get_input
---------
The get_input function is used to retrieve the values of properties declared within the inputs section of a TOSCA Service Template.
http://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/v1.2/csd01/TOSCA-Simple-Profile-YAML-v1.2-csd01.html#_Toc494454178
get_property
------------
The get_property function is used to retrieve property values between modelable entities defined in the same service template.
http://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/v1.2/csd01/TOSCA-Simple-Profile-YAML-v1.2-csd01.html#_Toc494454178
get_attribute
-------------
The get_attribute function is used to retrieve the values of named attributes declared by the referenced node or relationship template name.
http://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/v1.2/csd01/TOSCA-Simple-Profile-YAML-v1.2-csd01.html#_Toc494454179
get_operation_output
--------------------
The get_operation_output function is used to retrieve the values of variables exposed / exported from an interface operation.
http://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/v1.2/csd01/TOSCA-Simple-Profile-YAML-v1.2-csd01.html#_Toc494454180
get_artifact
------------
The get_artifact function is used to retrieve artifact location between modelable entities defined in the same service template.
http://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/v1.2/csd01/TOSCA-Simple-Profile-YAML-v1.2-csd01.html#_Toc494454182