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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="index6.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-schema2-6-3.html"><img alt="Previous" border="0" src="../default/i/previous.gif" name="topprevious"></a></td><td background="../default/i/sw-gold.gif"><a border="0" onMouseOver="iOver('topnext'); iOver('bottomnext'); self.status=nextblurb; return true;" onMouseOut="iOut('topnext'); iOut('bottomnext'); self.status=''; return true;" href="os-schema2-6-5.html"><img alt="Next" border="0" src="../default/i/next.gif" name="topnext"></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/titlebar6.jpg" alt="6. Elements and attributes"></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>Attribute declarations</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, sans-serif"><nobr> page 4 of 6</nobr></font></td></tr></table><br><br></p><font size="2" face="Verdana, Arial, sans-serif"><p>Complex Type definitions contain attributes, which are used by complex |
| elements. |
| Attributes themselves are always declared with a simple type. |
| This means that an element with attributes always has a complex |
| structure. |
| <br> |
| <br> |
| Attribute declarations can be global, local, or references, and are used |
| for: |
| <ul><li>Local validation of attribute information item |
| values using a simple type definition</li><li>Specifying default or fixed values for attribute |
| information items</li></ul> |
| |
| The <attribute> element contains attributes, which are described |
| by |
| <a href="http://www.w3.org/TR/xmlschema-1/#cAttribute_Declarations"> |
| XML Schema Part 1: Structures</a> of the standard.<br> |
| <br> |
| |
| The XML Schema model java interface for a <attribute> is |
| org.eclipse.xsd.XSDAttributeDeclaration and |
| can be created by calling |
| org.eclipse.xsd.XSDFactory.eINSTANCE.createXSDAttributeDeclaration(). |
| <br> |
| <br> |
| <b>Attribute use</b> |
| <br> |
| Local attribute declarations and attribute references can be optional, |
| required, or prohibited |
| by changing the attribute use usage attribute.<br> |
| If an attribute is local or a reference, it can contain attributes, |
| which |
| are described by <a href="http://www.w3.org/TR/xmlschema-1/#cAttributeUse"> |
| http://www.w3.org/TR/xmlschema-1/#cAttributeUse</a>.<br> |
| <br> |
| <b>Referencing a global attribute ceclaration</b> |
| <br> |
| If you declare a global attribute declaration, you can reference this |
| attribute in the remainder of the schema |
| using the ref attribute. This is done by calling the following method |
| on the |
| XML Schema model: |
| org.eclipse.xsd.XSDAttributeDeclaration.setResolvedAttributeDeclaration(XSDAttributeDeclaration). |
| <br> |
| <br> |
| <b>Any attribute</b> |
| <br> |
| The <anyAttribute> element enables us to extend the XML instance |
| document |
| with attributes not specified by the schema. |
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