/// <summary>
/// Evaluate an xpath filter, if it exists, against xpath variables
/// </summary>
/// <param name="nav">Navigator that may have an child XPathFilter element</param>
/// <param name="xpathVars">XPathVariable array to evaluate against, may be null</param>
/// <returns>Result of evaluation</returns>
static public bool EvaluateXPathFilter(XPathNavigator nav, XPathVariable[] xpathVars)
{
string filter = XmlHelpers.GetText(nav, "XPathFilter");
if (xpathVars == null || string.IsNullOrEmpty(filter))
{
return(true);
}
filter = "boolean( " + filter + " )";
bool result = (bool)Evaluate(filter, xpathVars);
return(result);
}
