/// <summary>
/// Gets a particular metadata tag's value. Return null if the meta tag doesn't exist
/// in this document.
/// </summary>
/// <param name="metaDataName">The name of the metadata element to retrieve</param>
/// <returns>The value</returns>
private string GetMetaDataValue(string metaDataName)
{
if (MetaTags.Contains(metaDataName))
{
return((string)MetaTags[metaDataName]);
}
else
{
return(null);
}
}