/// <summary>
/// Checks whether an element using this group can contain a specified element.
/// </summary>
/// <param name="name">The name of the element to look for.</param>
/// <param name="dtd">The DTD to use during the checking.</param>
/// <returns>true if an element using this group can contain the element, otherwise false.</returns>
/// <remarks>
/// Rough approximation - this is really assuming an "Or" group
/// </remarks>
public bool CanContain(string name, SgmlDtd dtd)
{
if (dtd == null)
throw new ArgumentNullException("dtd");
// Do a simple search of members.
foreach (object obj in Members)
{
if (obj is string)
{
if (string.Equals((string)obj, name, StringComparison.OrdinalIgnoreCase))
return true;
}
}
// didn't find it, so do a more expensive search over child elements
// that have optional start tags and over child groups.
foreach (object obj in Members)
{
string s = obj as string;
if (s != null)
{
ElementDecl e = dtd.FindElement(s);
if (e != null)
{
if (e.StartTagOptional)
{
// tricky case, the start tag is optional so element may be
// allowed inside this guy!
if (e.CanContain(name, dtd))
return true;
}
}
}
else
{
Group m = (Group)obj;
if (m.CanContain(name, dtd))
return true;
}
}
return false;
}
