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If I understand correctly you want to allow things such as <a>asdfgh</a> <a><b>oihvcg</b></a> In XML Schema 1.1 you can do this by defining the content model as mixed content, and then constraining it with an assertion: <xs:complexType> <xs:complexContent mixed="true"> <xs:sequence> <xs:element name="b" minOccurs="0" maxOccurs="1"/> </xs:sequence> </xs:complexContent> <xs:assert select="exists(text()) ne exists(b)"/> </xs:complexType> Doing it with conditional type assignment would be nicer in many ways: you really want to say that the type is either the simpleType xs:string or a complexType that only allows a <b> child - but conditional type assignment can only be driven from attribute values, so that's not possible here. Michael Kay http://www.saxonica.com/ > -----Original Message----- > From: G. Ken Holman [mailto:gkholman@C...] > Sent: 15 January 2008 17:29 > To: xml-dev@l... > Subject: Re: Element as value of another Element > > At 2008-01-15 07:50 -0800, Shashank Gupta wrote: > >I want to define an element of type string such that it's > value can be > >either of : > >-any string > >-value of another element of type string > > > >I am using Schema. > > Using W3C Schema 1.0 you cannot express that as a constraint. > > >Something like : > ><xs:simpleType name="a" value = any string OR another > element b of type > >string> > > Using the ISO/IEC 19757-3 Schematron assertion-based > constraint language you can express your desired constraint, > but it is run separately from W3C Schema. > > Off hand I'm not sure if the future W3C Schema 1.1 can help > in this regard ... I suspect that it can since it supports > co-occurrence constraints, but I don't know if there are limits. > > I hope this helps. > > . . . . . . . . . . . . . Ken > > -- > Comprehensive in-depth XSLT2/XSL-FO1.1 classes: Austin > TX,Jan-2008 World-wide corporate, govt. & user group XML, XSL > and UBL training > RSS feeds: publicly-available developer resources and training > G. Ken Holman mailto:gkholman@C... > Crane Softwrights Ltd. http://www.CraneSoftwrights.com/x/ > Box 266, Kars, Ontario CANADA K0A-2E0 +1(613)489-0999 (F:-0995) > Male Cancer Awareness Nov'07 http://www.CraneSoftwrights.com/x/bc > Legal business disclaimers: http://www.CraneSoftwrights.com/legal > > > ______________________________________________________________ > _________ > > XML-DEV is a publicly archived, unmoderated list hosted by > OASIS to support XML implementation and development. To > minimize spam in the archives, you must subscribe before posting. > > [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ > Or unsubscribe: xml-dev-unsubscribe@l... > subscribe: xml-dev-subscribe@l... List archive: > http://lists.xml.org/archives/xml-dev/ > List Guidelines: http://www.oasis-open.org/maillists/guidelines.php >
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