Help:Metadata

Pages in the main namespace may contain metadata, shown at the bottom of pages in a table generated by Template:Metadata.

This is similar to the concept of YAML Frontmatters, adapted for wikitext, and is intended to allow pages to store metadata that would otherwise be lost when converting to or from other formats than wikitext.

Information stored in the wikitext in this manner is intended to be parsable by code, and may cause the automatic addition of categories, messageboxes, and infoboxes to the page, or vice versa where the metadata table is updated due to the addition of a messagebox, category, etc.