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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+.. Copyright (C) 2019 IBM.
+
+Flexible Plug-in
+----------------
+
+Interaction with external systems is made plug-able, removing development cycle to support new endpoint.
+
+Currently, REST or SQL external systems are supported.
+
+An external system might be used by multiple resources, or by multiple scripts.
+
+In order to share the external system information, TOSCA provides a way to create macros using dsl_definitions:
+
+http://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/v1.2/csd01/TOSCA-Simple-Profile-YAML-v1.2-csd01.html#_Toc494454160
+http://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/v1.2/csd01/TOSCA-Simple-Profile-YAML-v1.2-csd01.html#_Toc494454173