SchemaNamespaceManager.cs

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namespace System.Xml.Schema;
 
internal sealed class SchemaNamespaceManager : XmlNamespaceManager
{
    private readonly XmlSchemaObject _node;
 
    public SchemaNamespaceManager(XmlSchemaObject node)
    {
        _node = node;
    }
 
    public override string LookupNamespace(string prefix)
    {
        if (prefix == "xml")
        {
            return "http://www.w3.org/XML/1998/namespace";
        }
        for (XmlSchemaObject xmlSchemaObject = _node; xmlSchemaObject != null; xmlSchemaObject = xmlSchemaObject.Parent)
        {
            if (xmlSchemaObject.Namespaces.TryLookupNamespace(prefix, out var ns))
            {
                return ns;
            }
        }
        if (prefix.Length != 0)
        {
            return null;
        }
        return string.Empty;
    }
 
    public override string LookupPrefix(string ns)
    {
        if (ns == "http://www.w3.org/XML/1998/namespace")
        {
            return "xml";
        }
        for (XmlSchemaObject xmlSchemaObject = _node; xmlSchemaObject != null; xmlSchemaObject = xmlSchemaObject.Parent)
        {
            if (xmlSchemaObject.Namespaces.TryLookupPrefix(ns, out var prefix))
            {
                return prefix;
            }
        }
        return null;
    }
}