XPATH axes come in very handy when nodes need to be selected based on (attribute’s or child element’s) values that must match those of other nodes elsewhere in the xml tree. Consider the following log4net configuration file :
<?xml version="1.0"?> <configuration> <configSections> <section name="nhibernate" type="System.Configuration.NameValueSectionHandler, System, Version=2.0.0.0,Culture=neutral, PublicKeyToken=b77a5c561934e089" /> <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" /> </configSections> <nhibernate> <add key="hibernate.connection.provider" value="NHibernate.Connection.DriverConnectionProvider" /> <add key="hibernate.connection.driver_class" value="NHibernate.Driver.SqlClientDriver" /> <add key="hibernate.connection.connection_string" value="Server=servername; Database=dbname; User=username; Password=secret;" /> <add key="hibernate.connection.isolation" value="ReadCommitted" /> <add key="hibernate.dialect" value="NHibernate.Dialect.MsSql2000Dialect" /> </nhibernate> <log4net> <appender name="NHibernateFileLog" type="log4net.Appender.RollingFileAppender"> <file value="Logs/nhibernate.txt" /> <appendToFile value="true" /> <rollingStyle value="Size" /> <maxSizeRollBackups value="10" /> <maximumFileSize value="100KB" /> <staticLogFileName value="true" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%d{HH:mm:ss.fff} [%t] %-5p %c - %m%n" /> </layout> </appender> <appender name="GeneralLog" type="log4net.Appender.RollingFileAppender"> <file value="Logs/general.txt" /> <appendToFile value="true" /> <maximumFileSize value="100KB" /> <rollingStyle value="Size" /> <maxSizeRollBackups value="5" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%d{HH:mm:ss.fff} [%t] %-5p %c - %m%n" /> </layout> </appender> <appender name="DataLog" type="log4net.Appender.RollingFileAppender"> <file value="Logs/data.txt" /> <appendToFile value="true" /> <maximumFileSize value="100KB" /> <rollingStyle value="Size" /> <maxSizeRollBackups value="5" /> <layout type="log4net.Layout.PatternLayout"> <conversionPattern value="%d{HH:mm:ss.fff} [%t] %-5p %c - %m%n" /> </layout> </appender> <!-- levels: DEBUG, INFO, WARN, ERROR, FATAL --> <root> <level value="DEBUG"/> <appender-ref ref="GeneralLog" /> </root> <logger name="NHibernate" additivity="false"> <level value="DEBUG"/> <appender-ref ref="NHibernateFileLog"/> </logger> <logger name="Pushable.Data" additivity="false"> <level value="DEBUG"/> <appender-ref ref="DataLog"/> </logger> </log4net> </configuration> The s are referenced by s using ‘ref’ attribute of their ‘appender-ref’ child elements, using the same value as the ’name’ attribute of the . This type of linking is quite common in xml documents. Now, The first question is : How to list files that are referenced by s ? In order to solve this problem you will need to reach the s that are referenced by each and then extract the ‘value’ of their s.
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