Defining elements in XML Scheme

[Ian Partridge]

Hi,

I'm having some problems working out how my XML Schema should be
constructed. Simply, if I have XML like:

<basetag>
<tag1>foo</tag1>
<tag2>bar</tag2>
<tag1>foo</tag1>
<tag2>bar</tag2>
<tag2>bar</tag2>
<tag1>foo</tag1>
<tag2>bar</tag2>
</basetag>

i.e. unlimited interleaved instances of tag1 and tag2 within basetag, how
should I define my Schema to support this? I can't see how <xs:sequence> or
<xs:choice> are appropriate in this case...

Any tips greatly appreciated.

Many thanks,
Ian Partridge

[Patrick TJ McPhee]

Re: Defining elements in XML Scheme

In article <Xns94258F11AC7 3Dipartridgeuki bmcom@9.20.142. 8>,
Ian Partridge <i.partridge@DI ESPAM.uk.ibm.co m> wrote:

% constructed. Simply, if I have XML like:
%
% <basetag>
% <tag1>foo</tag1>
% <tag2>bar</tag2>
% <tag1>foo</tag1>
% <tag2>bar</tag2>
% <tag2>bar</tag2>
% <tag1>foo</tag1>
% <tag2>bar</tag2>
% </basetag>
%
% i.e. unlimited interleaved instances of tag1 and tag2 within basetag, how
% should I define my Schema to support this? I can't see how <xs:sequence> or
% <xs:choice> are appropriate in this case...

Well, is it any of tag1 or tag2, or is it tag1 then tag2, any number
of times? From your use of interleaved, I guess it's the latter, so you
want

<xs:sequence maxOccurs='unbo unded'>
<xs:element name='tag1'.../>
<xs:element name='tag2'.../>
</xs:sequence>

If it were the former, you'd want xs:choice.
--

Patrick TJ McPhee
East York Canada
ptjm@interlog.c om

[Ian Partridge]

Re: Defining elements in XML Scheme

ptjm@interlog.c om (Patrick TJ McPhee) wrote in
news:bnueno$241 $1@news.eusc.in ter.net:
[color=blue]
> In article <Xns94258F11AC7 3Dipartridgeuki bmcom@9.20.142. 8>,
> Ian Partridge <i.partridge@DI ESPAM.uk.ibm.co m> wrote:
>
> % constructed. Simply, if I have XML like:
> %
> % <basetag>
> % <tag1>foo</tag1>
> % <tag2>bar</tag2>
> % <tag1>foo</tag1>
> % <tag2>bar</tag2>
> % <tag2>bar</tag2>
> % <tag1>foo</tag1>
> % <tag2>bar</tag2>
> % </basetag>
> %
> % i.e. unlimited interleaved instances of tag1 and tag2 within
> basetag, how % should I define my Schema to support this? I can't see
> how <xs:sequence> or % <xs:choice> are appropriate in this case...
>
> Well, is it any of tag1 or tag2, or is it tag1 then tag2, any number
> of times? From your use of interleaved, I guess it's the latter, so
> you want
>
> <xs:sequence maxOccurs='unbo unded'>
> <xs:element name='tag1'.../>
> <xs:element name='tag2'.../>
> </xs:sequence>
>
> If it were the former, you'd want xs:choice.[/color]

It is the former, sorry, I was unclear.

Basically tag1 and tag2 will each occur an unlimited number of times (or
not at all), randomly in any order.

Can I use <xs:choice> for that?

Thanks in advance,
Ian

[Mark Preston]

Re: Defining elements in XML Scheme

On Mon, 3 Nov 2003 22:22:21 +0000 (UTC), Ian Partridge
<i.partridge@DI ESPAM.uk.ibm.co m> wrote:
[color=blue]
>Basically tag1 and tag2 will each occur an unlimited number of times (or
>not at all), randomly in any order.
>
>Can I use <xs:choice> for that?
>[/color]
Yes, its a <choice> of either tag and in can occur up to the limit of
how many you want in the set - in other words, a choice that can be
repeated many times within the main tag.