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@@ -21,6 +21,7 @@
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<listitem><para><constant>XHTML1_STRICT</constant></para></listitem>
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<listitem><para><constant>XHTML1_TRANSITIONAL</constant></para></listitem>
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<listitem><para><constant>XHTML1_FRAMESET</constant></para></listitem>
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+ <listitem><para><constant>XHTML1_RDFA</constant></para></listitem>
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<listitem><para><constant>XHTML_BASIC1</constant></para></listitem>
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<listitem><para><constant>HTML4_STRICT</constant></para></listitem>
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<listitem><para><constant>HTML4_LOOSE</constant></para></listitem>
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@@ -86,7 +87,7 @@ if ($view->doctype()->isXhtml()) {
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]]></programlisting>
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<para>
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- You can also check if the doctype represents an <acronym>HTML5</acronym> document
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+ You can also check if the doctype represents an <acronym>HTML5</acronym> document.
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</para>
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<programlisting language="php"><![CDATA[
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@@ -95,6 +96,49 @@ if ($view->doctype()->isHtml5()) {
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}
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]]></programlisting>
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</example>
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+
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+ <example id="zend.view.helpers.initial.doctype.xhtml1_rdfa">
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+ <title>Choosing a Doctype to Use with the Open Graph Protocol</title>
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+
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+ <para>
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+ If you would like to implement the <ulink url="http://opengraphprotocol.org/">
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+ Open Graph Protocol</ulink>, it is best to specify the XHTML1_RDFA doctype.
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+ This doctype allows a developer to use the <ulink url="http://www.w3.org/TR/xhtml-rdfa-primer/">
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+ Resource Description Framework</ulink> within an <acronym>XHTML</acronym> document.
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+ </para>
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+
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+ <programlisting language="php"><![CDATA[
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+$doctypeHelper = new Zend_View_Helper_Doctype();
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+$doctypeHelper->doctype('XHTML1_RDFA');
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+]]></programlisting>
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+
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+ <para>
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+ It is not required to use the XHTML1_RDFA doctype to enable the Open Graph Protocol, but it is required to enable the namespaces inside the html tag:
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+ </para>
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+
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+ <programlisting language="html"><![CDATA[
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+$doctype = $view->doctype()->getDoctype();
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+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:og="http://opengraphprotocol.org/schema/" xmlns:fb="http://www.facebook.com/2008/fbml">
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+]]></programlisting>
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+
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+ <para>
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+ In the above example, we specifed two namespaces in the html tag. One for the Open Graph and another for <ulink url="http://developers.facebook.com/docs/opengraph">
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+ Facebook Open Graph</ulink>.
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+ </para>
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+
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+ <para>
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+ Here is how to specify a meta tag with a property:
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+ </para>
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+
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+ <programlisting language="html"><![CDATA[
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+<meta property="og:type" content="musician" />
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+]]></programlisting>
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+
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+ <para>
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+ We set the property to og:type. The og references the Open Graph namespace we specified in the html tag. The content identifies the page as being about a musician.
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+ </para>
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+
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+ </example>
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</sect3>
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<!--
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vim:se ts=4 sw=4 et:
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gammamatrix