As a meta-model, OCCI Core should be described in a formalized way, machine-readable, as to be able to generate implementations. We present here an XML representation of OCCI extensions and types with this objectives.

1. 1
This document is licensed under
a Creative Commons Attribution 3.0 Unported License.
Madrid, September 18th
, 2013
Jean Parpaillon – Silkan
Iain James Marshall – Prologue
Jonathan Custance - OnApp
OCCI XML representation

2. 22
This document is licensed under
a Creative Commons Attribution 3.0 Unported License.
September 18th, 2013 Cloud Interoperability Week
Background
✔ CompatibleOne : an open source cloud brokering
platform
✔ Based on OCCI
✔ With extensions: manifest, configuration, user, security, etc.
✔ Use XML for
✔ Storage
✔ Validation: categories described as XML schema (XSD)

3. 33
This document is licensed under
a Creative Commons Attribution 3.0 Unported License.
September 18th, 2013 Cloud Interoperability Week
Current extensions specs
✔ Free text + UML schemas
✔ Attributes types: string, numbers
✔ Attributes multiplicity: required, optional
✔ No attributes default value

4. 4
Objectives
Formal specifications
(machine readable,
including doc)
«Design once, implement everywhere »
Implementation generation
Attributes types specifications
Range
Patterns
Complex types
Rendering for XML
based protocol (XMPP)

5. 55
This document is licensed under
a Creative Commons Attribution 3.0 Unported License.
September 18th, 2013 Cloud Interoperability Week
XML reminder
✔ Formal constraint description: XML schemas
✔ Validation
✔ Transformation
✔ XSLT: XML to XML, XML to text
✔ Query
✔ XPATH
✔ Parsing
✔ Tree based, event based, ...

6. 66
This document is licensed under
a Creative Commons Attribution 3.0 Unported License.
September 18th, 2013 Cloud Interoperability Week
XML schema proposal (1)
✔ An XML schema to describe OCCI types
✔ Kind, Mixin, Action, Resource, Link
✔ Top-level elements:
✔ Extension (kind+, mixin+): for extensions
✔ Objects (kind+, mixin+, action+, resource+, link+): for
rendering

7. 7
OCCI type description
<xs:complexType name="kindType">
<xs:sequence>
<xs:element name="rel" type="occi:relatedType" minOccurs="1"
maxOccurs="1" />
<xs:element name="attribute" type="occi:attributeSpecType"
minOccurs="0" maxOccurs="unbounded" />
<xs:element name="action" type="occi:actionSpecType"
minOccurs="0" maxOccurs="unbounded" />
</xs:sequence>
<xs:attributeGroup ref="occi:categoryGroup"></xs:attributeGroup>
<xs:attribute name="location" type="xs:anyURI"></xs:attribute>
</xs:complexType>
<occi:kind term="network" scheme="http://schemas.ogf.org/occi/core#"
title="Network Resource">
<occi:rel scheme="http://schemas.ogf.org/occi/core#" term="resource" />
<occi:attribute name="occi.network.vlan" type="occi:vlanType" />
<occi:attribute name="occi.network.label" type="xs:string" />
<occi:attribute name="occi.network.state" type="xs:string"
immutable="true" use="required" default="inactive">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="active" />
<xs:enumeration value="inactive" />
</xs:restriction>
</xs:simpleType>
</occi:attribute>
<occi:action scheme="http://schemas.ogf.org/occi/core/network#"
term="up"></occi:action>
<occi:action scheme="http://schemas.ogf.org/occi/core/network#"
term="down"></occi:action>
</occi:kind>
OCCI types schema
OCCI type description

8. 8
OCCI entity rendering
<occi:link id="urn:uuid:c78774ae-264b-405b-b5ae-db6d2486ff8d"
source="/compute/996ad860-2a9a-504f-8861-aeafd0b2ae29"
target="/network/1cbc522b-eff3-4ea7-ab53-d91ad7c34b7f">
<occi:kind term="networkinterface" scheme="http://schemas.ogf.org/occi/infrastructure#" />
<occi:mixin term="ipnetworkinterface"
scheme="http://schemas.ogf.org/occi/infrastructure/networkinterface#" />
<occi:attribute name="occi.infrastructure.networkinterface.interface" value="eth0" />
<occi:attribute name="occi.infrastructure.networkinterface.mac" value="00:ae:ff:23:43:12" />
<occi:attribute name="occi.infrastructure.networkinterface.address" value="192.168.0.100" />
<occi:attribute name="occi.infrastructure.networkinterface.gateway" value="192.168.0.1" />
<occi:attribute name="occi.infrastructure.networkinterface.allocation" value="dynamic" />
<occi:action term="up"
scheme="http://schemas.ogf.org/occi/infrastructure/networkinterface/action#" />
</occi:link>
Link entity rendering
w/ mixin

9. 99
This document is licensed under
a Creative Commons Attribution 3.0 Unported License.
September 18th, 2013 Cloud Interoperability Week
XML schema proposal (2)
✔ Attribute types: inherits XSD typing
✔ 44 base types: decimal, string, date, etc.
✔ Type extension
✔ Integer + 'undefined'
✔ Type restriction
✔ String pattern
✔ Number range

10. 10
OCCI attribute type
<xs:simpleType name="vlanType">
<xs:restriction base="xs:integer">
<xs:minInclusive value="0"></xs:minInclusive>
<xs:maxInclusive value="4095"></xs:maxInclusive>
</xs:restriction>
</xs:simpleType>
<xs:simpleType name="mac802">
<xs:restriction base="xs:string">
<xs:pattern value="[da-fA-F]{2}(:[da-fA-F]{2})5}" />
</xs:restriction>
</xs:simpleType>
802.1q VLAN type
MAC Address

11. 1111
This document is licensed under
a Creative Commons Attribution 3.0 Unported License.
September 18th, 2013 Cloud Interoperability Week
That's all !
✔ Please comment, amend... implement
✔ Resources
✔ CompatibleOne project: http://www.compatibleone.org/
✔ Updated XML schemas and examples:
http://github.com/jeanparpaillon/occi-schemas
✔ E-mail: jean.parpaillon@free.fr

12. 12
This document is licensed under
a Creative Commons Attribution 3.0 Unported License.
Thanks !