svg:descTitleMetadata 

A bit simpler than the DTD, but see commented-out alternative

Element Group Information

Model

ALL(desc{0,1} title{0,1} metadata{0,1})
Children: desc, metadata, title

Used By

Complex Types svg:animateColorType, svg:animateMotionType, svg:animateTransformType, svg:animateType, svg:circleType, svg:clipPathType, svg:color-profileType, svg:cursorType, svg:ellipseType, svg:filterType, svg:font-faceType, svg:fontType, svg:imageType, svg:lineType, svg:linearGradientType, svg:mpathType, svg:pathType, svg:polygonType, svg:polylineType, svg:radialGradientType, svg:rectType, svg:setType, svg:switchType, svg:useType, svg:viewType

Source 

<group name="descTitleMetadata">
  <annotation>
    <documentation>A bit simpler than the DTD, but see commented-out alternative</documentation>
  </annotation>
  <all>
    <element name="desc" type="svg:descType" minOccurs="0"/>
    <element name="title" type="svg:titleType" minOccurs="0"/>
    <element name="metadata" type="svg:metadataType" minOccurs="0"/>
  </all>
</group>