<r> (Text Run)
This element specifies the presence of a run of text within the containing text body. The run element is the lowest level text separation mechanism within a text body. A text run may contain text run properties associated with the run. If no properties are listed then properties specified in the <defRPr> element are used.
example: 
<p:txBody>
  …
  <a:r>
    <a:rPr b="1">
    </a:rPr>
    <a:t>Some text</a:t>
  </a:r>
  …
  <a:r>
    <a:rPr/>
    <a:t>Some text</a:t>
  </a:r>
</p:txBody>
The above text body will have the first run be formatted bold and the second normally. ]
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The following XML Schema fragment defines the contents of this element:
<complexType name="CT_RegularTextRun">
	<sequence>
	<element name="rPr" type="CT_TextCharacterProperties" minOccurs="0" maxOccurs="1"/>
	<element name="t" type="xsd:string" minOccurs="1" maxOccurs="1"/>
	</sequence>
</complexType>