ValidateVisitor {

    {{
    private String errors = "";
    }}

    before Schema {{

        if (host.get_itemsListUnit().size() < 1)
            addError("Size (" + host.get_itemsListUnit().size() + ") of 'itemsListUnit' list cannot be less than 1");
    }}

    before Documentation {{

    int presentPartCount = 0;
    String presentParts = "";
    if (host.get_nonEmptyDocumentation() != null)
    {
        presentPartCount++;
        presentParts = presentParts + " nonEmptyDocumentation";
    }
    if (presentPartCount > 1)
        addError("Only one of these parts can be present in an element of type Documentation:\n" +
                 "    nonEmptyDocumentation\n" +
                 "  out of which these are present:" + presentParts + ".");
    }}

    before Attribute {{

    int presentPartCount = 0;
    String presentParts = "";
    if (host.get_nonEmptyAttribute() != null)
    {
        presentPartCount++;
        presentParts = presentParts + " nonEmptyAttribute";
    }
    if (host.get_EmptyAttribute() != null)
    {
        presentPartCount++;
        presentParts = presentParts + " EmptyAttribute";
    }
    if (presentPartCount > 1)
        addError("Only one of these parts can be present in an element of type Attribute:\n" +
                 "    nonEmptyAttribute, EmptyAttribute\n" +
                 "  out of which these are present:" + presentParts + ".");
    }}

    before Element {{

    int presentPartCount = 0;
    String presentParts = "";
    if (host.get_nonEmptyElement() != null)
    {
        presentPartCount++;
        presentParts = presentParts + " nonEmptyElement";
    }
    if (host.get_EmptyElement() != null)
    {
        presentPartCount++;
        presentParts = presentParts + " EmptyElement";
    }
    if (presentPartCount > 1)
        addError("Only one of these parts can be present in an element of type Element:\n" +
                 "    nonEmptyElement, EmptyElement\n" +
                 "  out of which these are present:" + presentParts + ".");
    }}

    before ComplexTypeContent {{

    int presentPartCount = 0;
    String presentParts = "";
    if (host.get_ComplexContent() != null)
    {
        presentPartCount++;
        presentParts = presentParts + " ComplexContent";
    }
    if (host.get_SequenceGroup() != null)
    {
        presentPartCount++;
        presentParts = presentParts + " SequenceGroup";
    }
    if (presentPartCount > 1)
        addError("Only one of these parts can be present in an element of type ComplexTypeContent:\n" +
                 "    ComplexContent, SequenceGroup\n" +
                 "  out of which these are present:" + presentParts + ".");
    }}

    public String get_return_val() {{
        return errors;
    }}

    private void addError(String errorText) {{
        errors = errors + "\n" + errorText;
    }}

}  // end of class ValidateVisitor