XPath 2.0 and XSLT 2.0

Grouping By Starting Value (Data)

Group the following data so that the implicit divisions created by each h1 are explicit:

<body>
  <h1>Introduction</h1>
  <p>XSLT is used to write stylesheets.</p>
  <p>XQuery is used to query XML databases.</p>
  <h1>What is a stylesheet?</h1>
  <p>A stylesheet is an XML document used to define a transformation.</p>
  <p>Stylesheets may be written in XSLT.</p>
  <p>XSLT 2.0 introduces new grouping constructs.</p>
</body>