Allow to use Create.js for Symfony/Cmf/BlogBundle. Place the xml file in the Resources/rdf-mappings directory. Below is a example file template for the Post content.

Symfony.Cmf.Bundle.BlogBundle.Document.Post.xml

<type
        xmlns:sioc="http://rdfs.org/sioc/ns#"
        xmlns:dcterms="http://purl.org/dc/terms/"
        xmlns:skos="http://www.w3.org/2004/02/skos/core#"
        typeof="sioc:Post"
        >
    <children>
        <property property="dcterms:title" identifier="title" tag-name="h1"/>
        <property property="sioc:content" identifier="body" />
    </children>
</type>

view_post.html.twig

{% extends "SymfonyCmfBlogBundle::default_layout.html.twig" %}
{% block content %}
{% createphp post as="rdf" %}
<div {{ createphp_attributes(rdf) }}>
  
<div class="row-fluid">
    <div class="span6">
        {% if prevPost %}
            <a href="{{ path(prevPost, {'slug': prevPost.slug}) }}">&lt;&lt; {{ prevPost.title }}</a>
        {% endif %}
    </div>
    <div class="span6" style="text-align: right">
        {% if nextPost %}
            <a href="{{ path(nextPost, {'slug': nextPost.slug}) }}">{{ nextPost.title }} &gt;&gt;</a>
        {% endif %}
    </div>
</div>
<div class="row-fluid">
    <div class="span12">
        <h1 {{ createphp_attributes( rdf.title ) }}>{{ createphp_content( rdf.title ) }}</h1>
    </div>
</div>
<div class="row-fluid">
    <div class="span6">
        <p><i>Posted on: {{ post.date.format('Y-m-d H:i:s') }}</i></p>
    </div>
    <div class="span6" style="text-align: right">
        <i>{% trans from "SymfonyCmfSimpleCmsBundle" %}Tagged{% endtrans %}:</i> 
        <i>{% include "SymfonyCmfBlogBundle:Blog:tags_inline.html.twig" %}</i>
    </div>
</div>
<div class="row-fluid">
    <div class="span12" {{ createphp_attributes( rdf.body ) }}>
    <div {{ createphp_attributes( rdf.body ) }}>{{ createphp_content( rdf.body )|nl2br|raw }}</div>
    </div>
</div>

</div>
{% endcreatephp %}
{% endblock %}