How do I specify a nullable xs:int?

[jacksuyu]

I have one xsd which defines element "Port" as "xs:int", and there are
bunch of xml files use "Port" element. But a lot of those files
contains <Port/>, which is treated invalid in xml validation.

I am wondering whether there is anyway to specify nullable integer, say
treat <Port/> the same as <Port>0</Port>?

Thanks in advance.

 

[Martin Honnen]

I am wondering whether there is anyway to specify nullable integer, say
treat <Port/> the same as <Port>0</Port>?

Yes, see <http://www.w3.org/TR/xmlschema-1/#declare-element>, you can do
<xs:element name="Port" type="xs:integer" nillable="true" />
and then the instance needs to have e.g.
<Port xsi:nil="true"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" />

<http://www.w3.org/TR/xmlschema-1/#xsi_nil> explains that too.

 

[Henry S. Thompson]

I am wondering whether there is anyway to specify nullable integer, say
treat <Port/> the same as <Port>0</Port>?

That's a defaulted xs:int, not a nullable one, and yes, just declare

<xs:element name="Port" type="xs:int" default="0"/>

ht
--
Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
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