Usando itemprop = "branchOf" do schema.org Microdata para se referir à empresa-mãe da LocalBusiness

Estou criando uma página da Web simples (bem, seria simples antes de eu decidir marcá-la com a Microdata) contendo informações de contato da empresa para uma empresa com dois escritórios. Estou usando o schema.org eNegócio loca para os dois escritórios.

qui estão as partes relevantes do meu HTM

<body itemscope itemtype="http://schema.org/Corporation">

    <header>
        <hgroup>
            <h1>Company Name</h1>
            <h2 itemprop="description">Company description</h2>
        </hgroup>
    </header>

    <section>

        <h1><span itemprop="name">Company Name Limited</span> Offices</h1>

        <article itemscope itemtype="http://schema.org/LocalBusiness">
            <h2 itemprop="name">Company Name, Location 1 Office</h2>
            <p itemprop="address" itemscope itemtype="http://schema.org/PostalAddress">
                <span itemprop="streetAddress">Street Address</span><br />
                <span itemprop="addressLocality">Locality</span><br />
                <span itemprop="addressRegion">Region</span><br />
                <span itemprop="postalCode">Postcode</span><br />
                <span itemprop="addressCountry">Country</span>
            </p>
            <p><a itemprop="maps" href="http://maps.google.co.uk/blahblah">Map</a></p>
            <p>Telephone: <span itemprop="telephone">01234 567890</span><br />
            Fax: <span itemprop="faxNumber">01234 567890</span><br />
            Email: <span itemprop="email">[email protected]</span><br />
            <a href="http://www.domain.co.uk" itemprop="url">http://www.domain.co.uk</a></p>
            <!-- itemprop="branchOf" -->
        </article>

        <article itemscope itemtype="http://schema.org/LocalBusiness">
            <h2 itemprop="name">Company Name, Location 2 Office</h2>
            <p itemprop="address" itemscope itemtype="http://schema.org/PostalAddress">
                <span itemprop="streetAddress">Street Address</span><br />
                <span itemprop="addressLocality">Locality</span><br />
                <span itemprop="addressRegion">Region</span><br />
                <span itemprop="postalCode">Postcode</span><br />
                <span itemprop="addressCountry">Country</span>
            </p>
            <p><a itemprop="maps" href="http://maps.google.co.uk/blahblah">Map</a></p>
            <p>Telephone: <span itemprop="telephone">01234 567890</span><br />
            Fax: <span itemprop="faxNumber">01234 567890</span><br />
            Email: <span itemprop="email">[email protected]</span><br />
            <a href="http://www.domain.co.uk" itemprop="url">http://www.domain.co.uk</a></p>
            <!-- itemprop="branchOf" -->
        </article>

    </section>

</body>

Onde eu tenho atualmente<!-- itemprop="branchOf" -->, Acredito que preciso associar oLocalBusinesses com oCorporation mencionado anteriormente na págin

Como devo fazer isso? Um ID de elemento pode ser usado para isso?

Obrigado

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