/// <summary>
/// Returns <code>true</code> if this properties contains a mapping for the specified property key.
/// </summary>
/// <param name="property">
/// the property key whose presence is to be tested
/// </param>
/// <returns> <code>true</code> if this properties contains a mapping for the specified property key </returns>
public virtual bool Contains <TK>(PropertyKey <TK> property)
{
return(properties.ContainsKey(property.Name));
}
/// <summary>
/// Associates the specified value with the specified property key. If the properties previously contained a mapping
/// for the property key, the old
/// value is replaced by the specified value.
/// </summary>
/// @param
/// <T>
/// the type of the value </param>
/// <param name="property">
/// the property key with which the specified value is to be associated
/// </param>
/// <param name="value">
/// the value to be associated with the specified property key
/// </param>
public virtual void Set <T>(PropertyKey <T> property, T value)
{
properties[property.Name] = value;
}