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Re: AS: Re: XML Schemas as AS Object Model

From: Peter Seiderer <Peter.Seiderer@ciselant.de>
Date: Thu, 7 Mar 2002 11:20:21 +0100
To: www-dom@w3.org
Message-ID: <20020307112021.A716@zodiak.ecademix.com>
On Wed, Mar 06, 2002 at 04:11:24PM -0800, Benjamin C. Chang wrote:
> Peter Seiderer wrote:
> 
> > Hello,
> > I am not shure about how a given XML Schema woul be represented as a
> > Abstract Schemas Object Model, see the following example:
> >
> > XML Schema example:
> >
> > <?xml version="1.0" encoding="iso-8859-1"?>
> >
> > <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
> >
> >  <xsd:element name="ElementA"  type="TypeA"/>
> >
> >   <xsd:complexType name="TypeA">
> >    <xsd:sequence>
> >     <xsd:element name="ElementB1"  type="TypeB" minOccurs="1" maxOccurs="1"/>
> >     <xsd:element name="ElementB2"  type="TypeB" minOccurs="0" maxOccurs="1"/>
> >    </xsd:sequence>
> >    <xsd:attribute name="AttributeA1" type="xsd:string"/>
> >    <xsd:attribute name="AttributeA2" type="xsd:string"/>
> >   </xsd:complexType>
> >
> >   <xsd:complexType name="TypeB">
> >    <xsd:sequence>
> >     <xsd:element name="Text"  type="xsd:string"/>
> >    </xsd:sequence>
> >   </xsd:complexType>
> >
> > </xsd:schema>
> >
> > Abstract Schemas Object Model:
> >
> > ASElementDecl example = {
> >                strictMixedContent = false;
> >                elemntType         = STRING_DATATYPE;
> >                isPCDataOnly       = false;
> >                contentType        = ELEMENTS_CONTENTTYPE;
> >                ASContentModel     = exE
> >                ASAttributeDecls   = null;
> > }
> 
> >
> >
> > ASContentModel exE = {
> >                listOperator = AS_SEQUENCE;
> >                minOccurs = 1;
> >                maxOccurs = 1;
> >                subModeld = {(ASElementDecl ElementA)};
> > }
> >
> > ASElementDecl ElementA = {
> >                strictMixedContent    = false;
> >                elementType           = STRING_DATATYPE;
> >                isPCDataOnly          = false;
> >                contentType           = ELEMENTS_CONTENTTYPE;
> >                ASContentModel        = TypeA;
> >                ASAttributeDecls      = null;
> > }
> >
> > ASContentModel TypeA = {
> >                listOperator          = AS_SEQUENCE;
> >                minOccurs             = 1;
> >                maxOccurs             = 1;
> >                subModels             = {(ASElementDecl ElementB1),
> >                                         (ASElementDecl ElementB2)};
> > }
> >
> > ASElementDecl ElementB1 = {
> >                strictMixedContent    = false;
> >                elementType           = STRING_DATATYPE;
> >                isPCDataOnly          = false;
> >                contentType           = ELEMENTS_CONTENTTYPE;
> >                ASContentModel        = TypeB;
> >                ASAttributeDecls      = null;
> > }
> >
> > ASContentModel TypeB = {
> >                listOperator          = AS_SEQUENCE;
> >                minOccurs             = 1;
> >                maxOccurs             = 1;
> >                subModels             = {(ASElementDecl Text)};
> > }
> >
> >  - Q1: But how is Elemnt B2 represented, because ASContentModel TypeB has the
> >        false minOccurs, maxOccurs values?
> 
> TypeA should be:
> 
> ASContentModel TypeA = {
>    contentModelType = SEQUENCE_CM;
>    minOccurs = 1;
>    maxOccurs = 1;
>    subModels = {(ASContentModel exB1), (ASContentModel exB2),
>                                (ASAttributeDecl attr1), (ASAttributeDecl attr2)};
> };
> 
> ASContentModel exB1 =
> {
>     contentModelType = SEQUENCE_CM;
>     minOccurs = 1;
>     maxOccurs = 1;
>     subModels = {(ASElementDecl B1)};
> }
> 
> ASElementDecl B1 =
> {
>    ...
>    ASContentModel = TypeB;
>    ...
> }
> 
> ASContentModel exB2
> {
>     contentModelType = SEQUENCE_CM;
>     minOccurs = 0;
>     maxOccurs = 1;
>     subModels = {(ASElementDecl B2)};
> }
> 
> ASElementDecl B2 =
> {
>     ...
>     ASContentModel = TypeB;
>     ...
> }
> 

I understand: this is done via an indirection using always ASContentModel
instead of direct link to ASElementDecl.
 
> 
> 
> >
> >
> > ASElementDecl ElementB2 = {
> >                strictMixedContent    = false;
> >                elementType           = STRING_DATATYPE;
> >                isPCDataOnly          = false;
> >                contentType           = ELEMENTS_CONTENTTYPE;
> >                ASContentModel        = TypeB;
> >                ASAttributeDecls      = null;
> > }
> >
> >  - Q2: Where to store the ASAttributeDecl AttributeA1 and AttributeA2 defined
> >        in the complexType TypeA, but in AS only ASElementDecl has the attribute
> >        ASAttributeDecls?
> 
> subModels contains a list of ASObjects, so in addition to ASElementDecl,
> it can also contain ASAttributeDecls (see above).

But for which purpose is then the attribute ASAttributecls in ASElementDecl?

interface ASElementDecl : ASObject {
 ...
 attribute ASNamedObjectMap ASAttributeDecls;
 ...
}

Should the attribute ASAttributeDecls moved form ASElementDecl to
interface ASContentModel?

I am not shure if this is different in the next version of AS, because
I see you are using already different names (contentModelType instead of
listOperator, SEQUENCE_CM instead of AS_SEQUENCE) as opposed the last
public available version:
http://www.w3.org/TR/2002/WD-DOM-Level-3-ASLS-20020114

Thank you for you last answer, it helped a lot....
 Peter Seiderer

-- 
------------------------------------------------------------------------
Peter Seiderer                     E-Mail:  Peter.Seiderer@ciselant.de
Received on Thursday, 7 March 2002 05:22:03 GMT

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