When writing metadata files (such as AppStream, package manifests, or configuration files), always consult and follow the official specifications precisely. Pay special attention to case-sensitive identifiers, valid values, and required formats.

Key practices:

Example from AppStream metadata:

<!-- Correct: Case-sensitive SPDX license ID -->
<project_license>Apache-2.0</project_license>
<!-- Valid metadata license from approved list -->
<metadata_license>MIT</metadata_license>

<!-- Modern tag with legacy compatibility -->
<developer_name>Developer Name</developer_name>
<developer id="org.example">
  <name>Developer Name</name>
</developer>

This prevents validation failures, ensures compatibility across different parsers, and maintains professional documentation standards.