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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Trying to make XMLada use a validating SAX Parser
Date: Thu, 04 Jun 2015 22:47:14 +0100
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Date: 2015-06-04T22:47:14+01:00
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Serge Robyns <serge.robyns@gmail.com> writes:

> package MyXML is
>       -- type MyReader is new SAX.Readers.Reader with null record;
>       type MyReader is new Schema.Readers.Validating_Reader with null record;
>
>       overriding procedure Start_Element (
>                                Handler           : in out MyReader;
>                                The_Namespace_URI : Unicode.CES.Byte_Sequence := "";
>                                The_Local_Name    : Unicode.CES.Byte_Sequence := "";
>                                Qname             : Unicode.CES.Byte_Sequence := "";
>                                Atts              : Sax.Attributes.Attributes'Class
>                               );
> end MyXML;
>
> When I try to compile the compiler complains that the subprogram
> "Start_Element" is not overriding.  However, according to the adacore
> documentation for xmlada it does say in section 6.4 that "As usual,
> you can still override the predefined ....".

Validating_Reader isn't (now?) derived from SAX.Readers.Reader but
instead from SAX.Readers.SAX_Reader, & the subprogram profile has
changed.

There's a comment in SAX.Readers recommending to upgrade to the new
forms.