The composite components have a built-in SEF URL generator. These components can take the SEF_MODE input parameter that can be Y or N. If SEF_MODE is N, the component works with physical links and passes all parameters via HTTP standard request parameters. For example,
If SEF_MODE is Y, the component generates and processes links using templates. For example, it can process the link
even if the component is in the /fld/cat.php file.
If SEF_MODE is Y, the component must have the SEF_FOLDER parameter that contains the path to the component working directory. This path can be the same as the physical path or it can be different. For example, the bitrix:catalog component in a file /fld/cat.php can have the parameters SEF_MODE = Y and SEF_FOLDER=/catalog/. The component will respond to requests having /catalog/... in URL. By default, the editor must set the current physical path of a current file.
Composite SEF URL enabled components must be assigned a set of default path templates. For example, the bitrix:catalog component can define the following array:
$arDefaultUrlTemplatesSEF = array( "list" => "index.php", "section" => "section.php?IBLOCK_ID=#IBLOCK_ID#&SECTION_ID=#SECTION_ID#", "element" => "element.php?ELEMENT_ID=#ELEMENT_ID#" );
These path templates can be redefined using the input parameter SEF_URL_TEMPLATES containing a new array of all or some path templates.
When saving a page having a component that operates in SEF mode, the editor creates or updates a URL Rewrite system record. For example, when saving the file /fld/cat.php containing the bitrix:catalog SEF mode component whose parameter is SEF_FOLDER=/catalog/, the following record is created or updated:
array( "CONDITION" => "#^/catalog/#", "ID" => "bitrix:catalog", "PATH" => "/fld/cat.php" ),
- CONDITION contains the value of SEF_FOLDER enclosed in #^ and #;
- ID is set to the component name;
- PATH contains the physical path to the file to which the component is added.
If a record with such PATH and ID already exists, it is updated; otherwise, it is created.
At runtime, a request for a non-existing page starts the URL Rewrite mechanism that looks up the rewrite table by CONDITION and passes control over to a page specified in PATH. The component on the PATH page determines the requested page by the path templates and restores the variables on the path.
"section" => "section/#SECTION_ID#.php?IBLOCK_ID=#IBLOCK_ID#", "element" => "element/#ELEMENT_ID#.php"
are valid because the static parts section and element are different.
"section" => "#SECTION_ID#.php?IBLOCK_ID=#IBLOCK_ID#", "element" => "#ELEMENT_ID#.php"
are invalid because there are no static parts that are different.
As you can see, file extensions, parameters and macros are not treated as static parts.