Better structure of files; introduced XML models

providers/xmlprovider/helpers.go

@@ -4,6 +4,7 @@ import (
 	"encoding/xml"
 	"io"
 	"os"
+	"path/filepath"
 
 	"github.com/Theodor-Springmann-Stiftung/kgpz_web/helpers/logging"
 )
@@ -30,3 +31,13 @@ func UnmarshalFile[T any](filename string, data T) error {
 	}
 	return nil
 }
+
+func XMLFilesForPath(path string) ([]string, error) {
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		return nil, err
+	}
+
+	matches, err := filepath.Glob(filepath.Join(path, "*.xml"))
+
+	return matches, err
+}