code: def _read_xsl(xsl):
      # Previously these values were allowed:
      if xsl == "mathml/data/simple_mmlctop.xsl":
          xsl = "simple_mmlctop.xsl"
      elif xsl == "mathml/data/mmlctop.xsl":
          xsl = "mmlctop.xsl"
      elif xsl == "mathml/data/mmltex.xsl":
          xsl = "mmltex.xsl"
  
      if xsl in ["simple_mmlctop.xsl", "mmlctop.xsl", "mmltex.xsl"]:
          xslbytes = _read_binary("sympy.utilities.mathml.data", xsl)
      else:
          xslbytes = Path(xsl).read_bytes()
  
      return xslbytes
  
imports: from pathlib import Path
  from sympy.utilities.decorator import doctest_depends_on
label_desc: Use image node_id 3 for calling a global function with example usage: _read_xsl(xsl) and returns: xslbytes