15-day Review for #TOSCA Simple Profile in YAML V1.0 - ends March 25th

The OASIS Topology and Orchestration Specification for Cloud Applications (TOSCA) TC members [1] have produced an updated Committee Specification Draft (CSD) and submitted this specification for 15-day public review:

TOSCA Simple Profile in YAML Version 1.0
Committee Specification Draft 05 / Public Review Draft 02
04 February 2016

Specification Overview:

The TOSCA Simple Profile in YAML specifies a rendering of TOSCA which aims to provide a more accessible syntax as well as a more concise and incremental expressiveness of the TOSCA DSL in order to minimize the learning curve and speed the adoption of the use of TOSCA to portably describe cloud applications.

This proposal describes a YAML rendering for TOSCA. YAML is a human friendly data serialization standard (http://yaml.org/) with a syntax much easier to read and edit than XML. As there are a number of DSLs encoded in YAML, a YAML encoding of the TOSCA DSL makes TOSCA more accessible by these communities.

The TOSCA metamodel uses the concept of service templates to describe cloud workloads as a topology template, which is a graph of node templates modeling the components a workload is made up of and as relationship templates modeling the relations between those components. TOSCA further provides a type system of node types to describe the possible building blocks for constructing a service template, as well as relationship type to describe possible kinds of relations.

Public Review Period:

The public review starts 11 March 2016 at 00:00 UTC and ends 25 March 2016 at 11:59 UTC. The specification was previously submitted for public review [2].

This is an open invitation to comment. OASIS solicits feedback from potential users, developers and others, whether OASIS members or not, for the sake of improving the interoperability and quality of its technical work.

Reviewers may provide comments directly from the comment-tag version of document. The file


contains the HTML version of the draft with a “[comment?]” link next to each section heading. Clicking on this link will launch your email application and begin a message to tosca-comment@lists.oasis-open.org with the specific section number and title in the subject line. Simply enter your comment and click send.

Note that you must be subscribed to the comment mailing list before sending feedback. Instructions on how to subscribe can be found at https://www.oasis-open.org/committees/comments/index.php?wg_abbrev=tosca.

The prose specification document and related files are available here:

PDF (Authoritative):


HTML with in-line commenting tags:

Editable source:

ZIP distribution files (complete):

For your convenience, OASIS provides a complete package of the prose specification and related files in a ZIP distribution file. You can download the ZIP file here:


Additional information about this specification and the TOSCA TC may be found on the TC's public home page located at:


Comments may be submitted to the TC by any person through the use of the OASIS TC Comment Facility which can be accessed via the button labeled "Send A Comment" at the top of the TC public home page, or directly at:


Feedback submitted by TC non-members for this work and for other work of this TC is publicly archived and can be viewed at:


All comments submitted to OASIS are subject to the OASIS Feedback License, which ensures that the feedback you provide carries the same obligations at least as the obligations of the TC members. In connection with this public review of 'TOSCA Simple Profile in YAML Version 1.0', we call your attention to the OASIS IPR Policy [3] applicable especially [4] to the work of this technical committee. All members of the TC should be familiar with this document, which may create obligations regarding the disclosure and availability of a member's patent, copyright, trademark and license rights that read on an approved OASIS specification.

OASIS invites any persons who know of any such claims to disclose these if they may be essential to the implementation of the above specification, so that notice of them may be posted to the notice page for this TC's work.

========== Additional references:

[1] OASIS Topology and Orchestration Specification for Cloud Applications (TOSCA) TC

[2] Previous public reviews:

30-day public review, 21 September 2015:
- Comment resolution log:

[3] http://www.oasis-open.org/policies-guidelines/ipr

[4] http://www.oasis-open.org/committees/tosca/ipr.php
RF on Limited Terms Mode

Associated TC: 
Topology and Orchestration Specification for Cloud Applications (TOSCA)