Use std::vector instead of array in MJCF schema.

PiperOrigin-RevId: 831787681
Change-Id: I8093b8b10260daecb830e49319eda798e2dd2da5

src/xml/xml_native_reader.h

@@ -17,6 +17,7 @@
 
 #include <sstream>
 #include <string>
+#include <vector>
 
 #include <mujoco/mujoco.h>
 #include <mujoco/mjspec.h>
@@ -102,6 +103,6 @@ class mjXReader : public mjXBase {
 
 // MJCF schema
 #define nMJCF 241
-extern const char* MJCF[nMJCF][mjXATTRNUM];
+extern std::vector<const char*> MJCF[nMJCF];
 
 #endif  // MUJOCO_SRC_XML_XML_NATIVE_READER_H_