/// <summary>
/// Declare a namespace for use by the XPath expression.
/// </summary>
/// <param name="prefix">The namespace prefix to be declared. Use
/// a zero-length string to declare the default namespace (that is, the
/// default namespace for elements and types).</param>
/// <param name="uri">The namespace URI. It is possible to specify
/// a zero-length string to "undeclare" a namespace.</param>
public void DeclareNamespace(String prefix, String uri)
{
if (cache != null)
{
cache.Clear();
}
env.declareNamespace(prefix, uri);
}
/// <summary>
/// Declare a namespace for use by the XPath expression.
/// </summary>
/// <param name="prefix">The namespace prefix to be declared. Use
/// a zero-length string to declare the default namespace (that is, the
/// default namespace for elements and types).</param>
/// <param name="uri">The namespace URI. It is possible to specify
/// a zero-length string to "undeclare" a namespace.</param>
public void DeclareNamespace(String prefix, String uri)
{
env.declareNamespace(prefix, uri);
}