Function xsltPreComputeExtModuleElement 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xsltPreComputeExtModuleElement(
    style: *mut _xsltStylesheet,
    inst: *mut _xmlNode,
) -> *mut _xsltElemPreComp

Precompute an extension module element.

UPSTREAM-PARITY

xsltElemPreCompPtr
xsltPreComputeExtModuleElement(xsltStylesheetPtr style, xmlNodePtr inst);

Looks the element up in the extension-element registry by (inst->name, inst->ns->href); if the registered module provides a precomputation callback it is used, otherwise a default _xsltElemPreComp is created with the registered transform function.

ENGINE-WIRING

The candidate mirror of upstream’s global xsltElementsHash is the private registry in this module (XSLT_ELEMENTS_REGISTRY). The ext-family ABI (exports_xslt_ext.rs) owns the public registration functions; this module’s registry is populated through them by whichever agent wires the module-level registration (documented cross-family wire-up point). With an empty registry the function returns NULL exactly like upstream with no registered elements.

SAFETY

• style must be a valid _xsltStylesheet, or NULL.
• inst must be a valid element node, or NULL.