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</table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr><td><font color="#006699" face="Verdana, sans-serif" size="-1"><a href="http://www.ibm.com/developer/">IBM developerWorks</a> : <a href="http://www.ibm.com/developer/xml/">XML</a> : <a href="http://www-106.ibm.com/developerworks/views/xml/tutorials.jsp">Education - Tutorials</a></font><br><img src="imagemaster/masthead.jpg" alt="XML Schema Infoset Model, Part 2"></td><td width="*" valign="bottom" align="right"><a border="0" href="os-schema2.zip"><img alt="ZIP" border="0" src="../default/i/icon-zip.gif"></a><a border="0" href="os-schema2-ltr.pdf"><img alt="PDF (letter)" border="0" src="../default/i/icon-pdf-ltr.gif"></a><a border="0" href="os-schema2-a4.pdf"><img alt="PDF (A4)" border="0" src="../default/i/icon-pdf-a4.gif"></a><a href="javascript:newWindow()" border="0"><img alt="e-mail" border="0" src="../default/i/icon-email.gif"></a></td></tr><tr><td height="2" colspan="2"><img height="2" width="1" src="../default/i/c.gif"></td></tr></table><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr><td width="150" height="1" bgcolor="#000000" colspan="6"><img alt="" height="1" width="150" src="../default/i/c.gif"></td></tr><tr><td background="../default/i/sw-gold.gif"><a border="0" href="index.html" onMouseOver="iOver('topmain'); iOver('bottommain'); self.status=mainblurb; return true;" onMouseOut="iOut('topmain'); iOut('bottommain'); self.status=''; return true;"><img alt="Main menu" border="0" src="../default/i/main.gif" name="topmain"></a></td><td background="../default/i/sw-gold.gif"><a border="0" onMouseOver="iOver('topsection'); iOver('bottomsection'); self.status=sectionblurb; return true;" onMouseOut="iOut('topsection'); iOut('bottomsection'); self.status=''; return true;" href="index3.html"><img alt="Section menu" border="0" src="../default/i/section.gif" name="topsection"></a></td><td background="../default/i/sw-gold.gif"><a border="0" onMouseOver="iOver('topfeedback'); iOver('bottomfeedback'); self.status=feedbackblurb; return true;" onMouseOut="iOut('topfeedback'); iOut('bottomfeedback'); self.status=''; return true;" href="os-schema2-9-3.html"><img alt="Feedback" border="0" src="../default/i/feedback.gif" name="topfeedback"></a></td><td width="100%" background="../default/i/sw-gold.gif"><img src="../default/i/c.gif"></td><td background="../default/i/sw-gold.gif"><a border="0" onMouseOver="iOver('topprevious'); iOver('bottomprevious'); self.status=previousblurb; return true;" onMouseOut="iOut('topprevious'); iOut('bottomprevious'); self.status=''; return true;" href="os-schema2-3-9.html"><img alt="Previous" border="0" src="../default/i/previous.gif" name="topprevious"></a></td><td background="../default/i/sw-gold.gif"><img border="0" src="../default/i/xnext.gif"></td></tr><tr><td width="100%" colspan="5"></td><td width="108" height="1" bgcolor="#000000" align="right"><img alt="" height="1" width="108" src="../default/i/c.gif"></td></tr><tr><td colspan="5"></td><td align="right"><a border="0" onMouseOver="iOver('topnextsection'); iOver('bottomnextsection'); self.status=nextsectionblurb; return true;" onMouseOut="iOut('topnextsection'); iOut('bottomnextsection'); self.status=''; return true;" href="os-schema2-4-1.html"><img alt="Next Section" src="../default/i/nextsection.gif" border="0" name="topnextsection"></a></td></tr></table><table bgcolor="ffffff" cellspacing="0" cellpadding="2" border="0" height="400" width="100%"><tr valign="bottom"><td height="25" colspan="4"><img border="0" height="25" width="562" src="imagemaster/titlebar3.jpg" alt="3. Simple types"></td></tr><tr><td bgcolor="ffffff" width="15"> </td><td bgcolor="ffffff" width="12"> </td><td valign="top" align="left" bgcolor="ffffff" width="*"><p><br><table cellspacing="0" cellpadding="0" border="0"><tr><td width="90%"><font size="4" face="Verdana, Arial, sans-serif"><b>Union data types</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, sans-serif"><nobr> page 10 of 10</nobr></font></td></tr></table><br><br></p><font size="2" face="Verdana, Arial, sans-serif"><p>Union data types are those whose value spaces and lexical spaces are the union
of value spaces and lexical spaces of two or more other data types. A union
data
type enables an element or attribute value to be one or more instances of a
type
drawn from the union or combination of multiple atomic and list types.
Union types have a memberTypes attribute value that is a list of all the types
in the union.
Union types can also have pattern and enumeration facets.<br>
<br>
Union data type elements may contain some attributes, which are described by
<a href="http://www.w3.org/TR/xmlschema-1/#declare-datatype">
http://www.w3.org/TR/xmlschema-1/#declare-datatype.</a>
<br>
<br>
Refer to the <a href="http://www.w3.org/TR/xmlschema-0/#UnionDt">
XML Schema Part 0: Primer</a> for more information on the union data type.<br>
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