WS-Calendar Minimal PIM-Conformant Schema v1.0 CS01 published by WS-Calendar TC

OASIS is pleased to announce the approval and publication of a new Committee Specification by the members of the OASIS Web Services Calendar (WS-Calendar) TC [1]:

WS-Calendar Minimal PIM-Conformant Schema Version 1.0
Committee Specification 01
26 September 2016

What is the Minimal PIM-Conformant Schema and why is it important?

The WS-Calendar Minimal PIM-Conformant Schema is a schema that conforms with the WS-Calendar Platform Independent Model (PIM). The schema is minimal to optimize for use in machine-to-machine (M2M) schedule negotiations.

iCalendar (RFC5545) and its peer specification XCAL (also in WS-Calendar 1.0)is a well-known and long used means to convey schedule-related information. iCalendar makes extensive use of extension and recursion. The WS-Calendar Platform Independent Model (PIM) constrains iCalendar and defines a simpler information model which shares iCalendar semantics and can be used to create as the common basis for any number of Platform Specific Models (PSMs).

Because an information model is abstract, it can apply to many transmission and serialization schemas. The PIM itself does not include a transmission and serialization schema. Through transitive conformance such PSMs themselves conform to WS-Calendar. The Minimal PIM-Conformant (MIN) schema defines an XML Schema that conforms just with the PIM. MIN can be used by itself or as a seed-schema for other specifications.

This is a final deliverable. Completed and approved by the TC, this OASIS Committee Specification is fully ready for implementation. If submitted for further ratification as an OASIS Standard, its content will not change.

About the TC:

The OASIS Web Services Calendar (WS-Calendar) Technical Committee was chartered to adapt the existing specifications for calendaring and apply them to develop a standard for how schedule and event information is passed between and within services. The standard should adopt the semantics and vocabulary of iCalendar for application to the completion of web service contracts.

The prose specifications and related files are available here:

PDF (Authoritative):


Editable source:

XML schema:

Distribution ZIP file

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:

Members of the OASIS Web Services Calendar (WS-Calendar) TC approved this specification by Special Majority Vote. The specification had been released for public review as required by the TC Process [2]. The vote to approve as a Committee Specification passed [3], and the document is now available online in the OASIS Library as referenced above.

Our congratulations to the TC on achieving this milestone and our thanks to the reviewers who provided feedback on the specification drafts to help improve the quality of the work.

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

[1] OASIS Web Services Calendar (WS-Calendar) TC

[2] Public reviews:
- 30-day public review, 20 January 2016:
- Comment resolution log:

- 30-day public review, 01 July 2016:
- Comment resolution log:

[3] Approval ballot:

Associated TC: 
Web Services Calendar (WS-Calendar)