Lesson 3

XML in Maven and Android

POM and manifest patterns.

Maven POM

A minimal POM nests coordinates and build metadata:

<project xmlns="http://maven.apache.org/POM/4.0.0">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.example</groupId>
  <artifactId>demo-app</artifactId>
</project>

Teams format POMs before review so dependency diffs stay readable. Validate after merging conflict markers or manual edits.

Android manifest

Manifests declare package name, permissions, and components. Namespace attributes (android:*) are common. A single unclosed <activity> breaks the entire build—line/column errors save time.

SVG and sitemaps

SVG is XML markup for graphics; sitemaps list URLs for crawlers. Both benefit from consistent indentation when humans edit them in PRs.

Key takeaway

Pick project-appropriate examples, validate locally, then format. Build tools assume well-formed XML, not pretty spacing.

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