passing loader context

loader.js

@@ -9,7 +9,7 @@ const schema = {
     properties: {
         expr: {
             type: 'string',
-            default: '(use-modules (sxml simple))(sxml->xml SXML_LOADER_CONTENT)',
+            default: '(define loader-context \"SXML_LOADER_CONTEXT\")(use-modules (sxml simple))(sxml->xml SXML_LOADER_CONTENT)',
         },
         doctype: {
             type: 'string',
@@ -36,6 +36,7 @@ module.exports = function(content, map, meta) {
     if (options.expr)
         expr = options.expr;
     expr = expr.replace('SXML_LOADER_CONTENT', content);
+    expr = expr.replace('SXML_LOADER_CONTEXT', this.context + '/');
 
     const cb = this.async();
     runScheme('guile', ['-c', expr]).then(data => {