how to define a key which generates unique sequence number?

[XML fellow]

hi,
i would like to define a unique key in the XSD, and once generating a
default XML out of it (using XSD2INST tool), the XML will automaticaly
be populated with a unique sequence number.

similar to defining a sequence number in DB.

can anyone advise how to do that?

thanks :-)


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[Martin Honnen]

Re: how to define a key which generates unique sequence number?

XML fellow wrote:

i would like to define a unique key in the XSD, and once generating a
default XML out of it (using XSD2INST tool), the XML will automaticaly
be populated with a unique sequence number.
>
similar to defining a sequence number in DB.
>
can anyone advise how to do that?

A key is defined with the xs:key element and its child elements
xs:selector and xs:field, see

http://www.w3.org/TR/xmlschema-0/#specifyingKeysAndtheirRefs

Whether that tool you mention is then able to generate keys I don't
know. You might want to check its documentation or find out whether
there is a support forum or mailing list.


--

Martin Honnen
http://JavaScript.FAQTs.com/

[XML fellow]

Re: how to define a key which generates unique sequence number?



thanks :-)
I'm familiar with the Key/Key-ref items.
my question relates more to the 'sequence' issue. when you define
selector it relates to some pre-defined key. i need this key to be a
sequence, i.e. i++ each time it's being used.

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