@Override
  public SchemaPrefix getPrefixDeclaration(final XmlTag context, String namespacePrefix) {
    @NonNls String nsDeclarationAttrName = null;
    for(XmlTag t = context; t != null; t = t.getParentTag()) {
      if (t.hasNamespaceDeclarations()) {
        if (nsDeclarationAttrName == null) nsDeclarationAttrName = namespacePrefix.length() > 0 ? "xmlns:"+namespacePrefix:"xmlns";
        XmlAttribute attribute = t.getAttribute(nsDeclarationAttrName);
        if (attribute != null) {
          final String attrPrefix = attribute.getNamespacePrefix();
          final TextRange textRange = TextRange.from(attrPrefix.length() + 1, namespacePrefix.length());
          return new SchemaPrefix(attribute, textRange, namespacePrefix);
        }
      }
    }
    return null;
  }
@Override
  public SchemaPrefix getPrefixDeclaration(final XmlTag context, String namespacePrefix)