/// <summary>
/// Read hyphenation patterns from an <see cref="XmlReader"/>.
/// </summary>
/// <param name="source"> <see cref="XmlReader"/> input source for the file </param>
/// <exception cref="IOException"> In case the parsing fails </exception>
public virtual void LoadPatterns(XmlReader source)
{
PatternParser pp = new PatternParser(this);
ivalues = new TernaryTree();
pp.Parse(source);
// patterns/values should be now in the tree
// let's optimize a bit
TrimToSize();
m_vspace.TrimToSize();
m_classmap.TrimToSize();
// get rid of the auxiliary map
ivalues = null;
}