URLs and paths

abs_url: Absolute URL against baseURL (base path kept).
rel_url: Root-relative URL with the base path.
abs_lang_url: abs_url with the language prefix of page’s language.
rel_lang_url: rel_url with the language prefix of page’s language.
ref: The permalink of the page at path; unresolved per refLinksErrorLevel.
rel_ref: The relative permalink of the page at path.
parse_url: {scheme, host, path, fragment, query, is_absolute, string}.
join_url: Joins URL parts with single slashes.
path_ext: Extension with the dot.
path_base: Last element.
path_base_name: Last element without extension.
path_dir: All but the last element.
path_clean: Lexically cleaned path.
path_join: Joins parts and cleans the result.