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Determining the Context Size

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To obtain the number of nodes in the current context, call the
    <code class="cCode"> last() </code>function. The format is
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number last() 
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The
    <code class="cCode"> last()</code> function returns a number equal to the context size of the expression evaluation context. Essentially, the 
    <code class="cCode">last()</code> function returns the position number of the last node in document order for the current context. For example, the following query returns all books if there are three or more of them. There are three 
    <code class="cCode">book</code> elements in the current context. Consequently, this query returns three 
    <code class="cCode">book</code> elements. 
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/bookstore/book[last() &gt;= 3]
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