Load declarations from reusable sources

A cem-element src can select a template in this document, load a whole external document, or select its #fragment. Relative dependencies resolve from the source file, not its consumer.

A named declaration is reusable; omitting tag renders an anonymous instance in place. Payload remains the fallback when a source or fragment is missing. Imported document scripts are not executed.

CEM-ML is the preferred template format. The XSLT examples demonstrate the bounded compatibility path: whole stylesheets use their XSLT media type; embedded stylesheets use an explicit template lang="custom-element-v0" wrapper. Selecting an ID alone does not opt unannotated markup into XSLT execution.

See also

Retained document trees and branch selection

Editable XML, CSV, YAML and JSON tables

Mapped sources and relative URLs

External template styles

Reusable payload-driven grid