| DelegatingEngine | DelegatingEngine selects an engine for a given template. |
| GlobalVariables | GlobalVariables is the entry point for Symfony global variables in PHP templates. |
| PhpEngine | This engine knows how to render Symfony templates. |
| TemplateFilenameParser | TemplateFilenameParser converts template filenames to TemplateReferenceInterface instances. |
| TemplateNameParser | TemplateNameParser converts template names from the short notation "bundle:section:template.format.engine" to TemplateReferenceInterface instances. |
| TemplateReference | Internal representation of a template. |
| TimedPhpEngine | Times the time spent to render a template. |