On 8/24/06, Miguel Montes wrote:
Thanks Stepan. So, it should be
BDTD ::= SEQUENCE {
name UTF8String,
entity SET OF HTMLEntity,
element SET OF HTMLElement
}
HTMLEntity ::= SEQUENCE {
name UTF8String,
value INTEGER,
general [0] IMPLICIT BOOLEAN DEFAULT FALSE,
parameter [1] IMPLICIT BOOLEAN DEFAULT FALSE,
data UTF8String
}
HTMLElement ::= SEQUENCE {
index INTEGER,
name UTF8String,
type INTEGER,
oStart BOOLEAN,
oEnd BOOLEAN,
exclusions SET OF INTEGER,
inclusions SET OF INTEGER,
attributes SET OF HTMLElementAttributes OPTIONAL,
contentModel HTMLContentModel
}
HTMLContentModel ::= SEQUENCE OF SEQUENCE {
type INTEGER,
index INTEGER
}
HTMLElementAttributes ::= SEQUENCE {
name UTF8String,
type INTEGER,
modifier INTEGER,
defaultValue UTF8String OPTIONAL,
possibleValues SET OF UTF8String OPTIONAL
}
If we want exclusions and inclusions in HTMLElement to be optional, it
should be something like
HTMLElement ::= SEQUENCE {
index INTEGER,
name UTF8String,
type INTEGER,
oStart BOOLEAN,
oEnd BOOLEAN,
exclusions [0] IMPLICIT SET OF INTEGER OPTIONAL,
inclusions [1] IMPLICIT SET OF INTEGER OPTIONAL,
attributes SET OF HTMLElementAttributes OPTIONAL,
contentModel HTMLContentModel
}
Is this right?
Yes, that is right.
- Stepan.
On 8/23/06, Stepan Mishura wrote:
>
> Hi Miguel,
>
> I've looked thought proposed ASN.1 notation and it looks OK for me. I
have
> only few comments.
> (However I don't know all details of DTD, i.e. I've not checked whether
> your
> notation correctly represents DTD so I'll comment only proposed
> ASN.1notation.)
>
> BTW, I've changed the subject if you don't mind.
>
> Common remark: a component of SEQUENCE(OF), SET(OF) should starts with a
> lower-case letter.
>
> Other comment see below.
>
> On 8/23/06, Miguel Montes wrote:
>
> > Hi:
> > We are working on the html parser, and need to have working DTD. The
> > current
> > implementation of DTD.read(), based on serialization, has some
problems,
> > and
> > I think we should have a well defined binary format. I suggest the
> > following
> > ASN.1 format, and if there is consensus on it, we could contribute the
> > code
> > to read and write it.
> > I would like to hear the opinion of Stepan and anyone who has worked
> with
> > ASN.1 before.
> >
> > BDTD ::= SEQUENCE {
> > Name UTF8String,
> > Entity SET OF HTMLEntity,
> > Element SET OF HTMLElement
> > }
> >
> > HTMLEntity ::= SEQUENCE {
> > Name UTF8String,
> > Value INTEGER,
> > General BOOLEAN DEFAULT FALSE,
> > Parameter BOOLEAN DEFAULT FALSE,
> > Data UTF8String
> > }
>
>
> This won't work. I'll try to explain. We have 2 DEFAULT components here.
> If
> a component is declared as DEFAULT then it is also OPTIONAL and can be
> missed. A decoder can detect which component is missed only if a in
block
> of
> OPTIONAL components plus next mandatory component all elements are
> distinct.
>
> We have the next block:
> general BOOLEAN DEFAULT FALSE
> parameter BOOLEAN DEFAULT FALSE
> data UTF8String
>
> So 1-st and 2-nd elements are not distinct. This can be fixed by tagging
> some elements. I'd use implicit tagging, for example:
>
> general BOOLEAN DEFAULT FALSE
> parameter [0] IMPLICIT BOOLEAN DEFAULT FALSE
>
> or
>
> general [0] IMPLICIT BOOLEAN DEFAULT FALSE
> parameter [1] IMPLICIT BOOLEAN DEFAULT FALSE
>
> Thanks,
> Stepan.
>
> P.S. I'll let you know if I have more corrections.
>
>
>
>
>
> > HTMLElement ::= SEQUENCE {
> > Index INTEGER,
> > Name UTF8String,
> > Type INTEGER,
> > OStart BOOLEAN,
> > OEnd BOOLEAN,
> > Exclusions SET OF INTEGER,
> > Inclusions SET OF INTEGER,
> > Attributes SET OF HTMLElementAttributes OPTIONAL,
> > ContentModel HTMLContentModel,
> > }
> >
> > HTMLContentModel ::= SEQUENCE OF SEQUENCE {
> > Type INTEGER,
> > Index INTEGER
> > }
> >
> > HTMLElementAttributes ::= SEQUENCE {
> > Name UTF8String,
> > Type INTEGER,
> > Modifier INTEGER,
> > DefaultValue UTF8String OPTIONAL,
> > PossibleValues SET OF UTF8String OPTIONAL
> > }
> > --
> > Miguel Montes
> >
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