JavaBeat Certifications Certifications Kits Articles Interview Questions OCAJP 7 OCPJP 5 OCPJP 6 OCEJWCD 6 SCBCD 5.0 SCEA SCJA

How can I include a conditional statement in my XML?

Topic :
Feedback Request New QnA Print Email

You can't: XML isn't a programming language, so you can't say things like
<google if {DB}="A">bar</google>
If you need to make an element optional, based on some internal or external criteria, you can do so in a Schema. DTDs have no internal referential mechanism, so it isn't possible to express this kind of conditionality in a DTD at the individual element level.
It is possible to express presence-or-absence conditionality in a DTD for the whole document, by using parameter entities as switches to include or ignore certain sections of the DTD based on settings either hardwired in the DTD or supplied in the internal subset. Both the TEI and Docbook DTDs use this mechanism to implement modularity.
Alternatively you can make the element entirely optional in the DTD or Schema, and provide code in your processing software that checks for its presence or absence. This defers the checking until the processing stage: one of the reasons for Schemas is to provide this kind of checking at the time of document creation or editing.
I have to do an overview of XML for my manager/client/investor/advisor.

Topic :
Feedback Request New QnA Print Email

All api java java 6.0 java 7.0 jdbc jsp servlet ejb jndi jms ejb 3.0 j2ee jee 5.0 jee 6.0 jsf struts spring Hibernate ajax JBoss Seam netbeans eclipse ant xml maven dojo junit javafx j2me log4j ESB JBoss Apache Quartz scjp mysql oracle gwt openjpa jmx yui google-guice android JBoss scwcd 5.0 scjp 1.5 scjp 1.6 scja scbcd 5.0

javabeat | advertise | about us | contact | useful resources
Copyright (2004 - 2013), JavaBeat