[
Lists Home |
Date Index |
Thread Index
]
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Li Yuejiong(John) writes:
> The following piece of schema is from a released Schema definition.The
> problem is the attribute "fixed". In the element definition, fixed="" is
> correct or not?
>
> <complexType name="countryItemType">
> <simpleContent>
> <restriction base="stringItemType">
> <length value="0" fixed="true" />
In this case, 'fixed' means that no further restriction is allowed by
subsequent restrictions (actually pointless here, since 0 is as low as
you can go, but perfectly legal).
> </restriction>
> </simpleContent>
> </complexType>
>
> <element id="id_Afghanistan" name="Afghanistan" type="countryItemType"
> substitutionGroup="CountryItemHead" fixed="" nillable="true" />
In this case the 'fixed' attribute has the force that elements
validated with this declaration must always be empty.
Taken together this all overdoes it a bit, in that elements validated
by the above declaration must always be empty for two _distinct_
reasons, namely the 'fixed' on the elt decl and the restriction to
length 0 of its type.
Also, under the circumstances, 'nillable="true"' is pointless, as it
means elements validated by that decl _may_ be empty even if their
type doesn't allow that, but the type _does_ allow that, so . . .
ht
- --
Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
Half-time member of W3C Team
2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
Fax: (44) 131 650-4587, e-mail: ht@inf.ed.ac.uk
URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged spam]
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.6 (GNU/Linux)
iD8DBQFDlHf9kjnJixAXWBoRAkjXAJ0T7uVzA0Nl/uJov1QDrcttStg9VgCfUPze
ATSBD3PQ/YnHV++WeDnjdQ8=
=SAbo
-----END PGP SIGNATURE-----
|
