extending html5 microdata event schema

Have been adding html5 microdata to my online resume, and read in http://www.schema.org/docs/extension.html that you can extend existing schema.

I've been trying to extend Event to describe a Job with the following markup:

        <div class="job" itemscope itemtype="http://schema.org/Event/Job">
            <h2 itemprop="name">Web Developer</h2>
            <div itemprop="organizer" itemscope itemtype="http://schema.org/Organization">
                <span itemprop="name">Company Name 2</span>
                <span itemprop="location">London</span>
            </div>
            <span itemprop="startDate">January 2000</span>
            <span itemprop="endDate">February 2009</span>
            <p itemprop="description">Lorem ipsum dolor sit amet, consectetuer adipiscing elit...</p>
        </div>

When i use the Google Structured Data Testing Tool it gives the following errors:

        Item
            type:   http://schema.org/event/job
            property:
              name:         Web Developer
              organizer:    Item 4
              start date:   January 2000
              enddate:      February 2009
              description:  Lorem ipsum dolor sit amet, consectetuer adipiscing elit...
        Error: Page contains property "name" which is not part of the schema.
        Error: Page contains property "organizer" which is not part of the schema.
        Error: Page contains property "startdate" which is not part of the schema.
        Error: Page contains property "enddate" which is not part of the schema.
        Error: Page contains property "description" which is not part of the schema.
        Error: Missing required field "dtstart".
        Error: Missing required field "name".

Any ideas what's wrong? and how it should be done?

Many thanks,!

Solution

Google’s tool is wrong about the errors, probably because they don’t handle the case of Schema.org extensions (which is a valid use of the vocabulary).

But note that this extension mechanism is considered "outdated" anyway, see docs/extension.html is out of date, should be marked as such or fixed. It’s intended to display this message on the extension page soon:

Historical ("Slash-based") Extension Mechanism (2011-2013)

Status Note: We preserve this text to document our original approach to extensibility. We do not currently advocate the use of '/'-based extended names, although it should be harmless to use these. Other mechanisms including RDFa, JSON-LD, the Role type and additionalType property can now also be used for different extension scenarios.

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(By the way, your values of startDate and endDate are not valid: you need to use the ISO 8601 date format.)