Introduction and use of xml files

UseNokogiriforfast,robustXMLparsinginRails:installviagem'nokogiri',parsewithNokogiri::XML,handleencoding/namespacesexplicitly,andextractdatasafelyusingcss()/xpath()whilecheckingdoc.errorsand.textguards.

Use tools or programming methods to compare XML file differences: first use online tools (such as xmlcompare.org) or IDE plug-ins for visual comparison, and then implement automated analysis through the command line (such as xmllint diff) or Python scripts (using the lxml library to parse and standardize XML). Pay attention to the processing of whitespace characters, attribute order, namespace prefixes and other influencing factors. It is recommended to use CanonicalXML to eliminate format differences.

XMLshowsgarbledtextwhendeclaredUTF-8encodingmismatchesactualbyteencoding;verifywithfile-iorxxd,fixbyresavingcorrectly,andparseinbinarymodetohonortheXMLdeclaration.

XMLremainswidelyusedinmodernconfigurationfilesduetoitsstructured,hierarchicaldatarepresentation,enablingclearparent-childrelationshipsandmetadatastorageviatagsandattributes,asseeninpom.xmlandweb.config.2.ItsupportsformalvalidationthroughXSDandDTDsche

XmlSerializerisidealforsimple,attribute-drivenXMLserializationinC#,requiringpublicproperties,parameterlessconstructors,andconcretetypes;itignores[Serializable],supportsListbutnotDictionary,lackscircularreferencehandling,andneedsexplicitnull/namespace

The pom.xml file declares dependencies through groupId, artifactId and version, and can use scope to specify the scope; 2. Multi-module projects use dependencyManagement to unify versions; 3. Maven automatically handles transitive dependencies, and exclusions can be used to exclude conflicting libraries; 4. Use MavenVersionsPlugin to check dependency updates to keep projects safe and consistent.

To delete a specific node, you need to operate based on the tag name and conditions (such as attribute values ​​or text content): the liveNodeList must be traversed in reverse order and removeChild() is called; XPath is recommended for complex conditions; be sure to check that the parent node is not empty before deleting to avoid NPE; performance and memory limitations should be considered for large-scale deletions.

Use the XmlSerializer class to deserialize XML into a C# object. You need to define a class that matches the XML structure and annotate it with attributes such as XmlElement and XmlAttribute. Then read the XML stream and convert it into an object instance through the Deserialize method.