xml - How to assign glyphs to control characters? -


it seems xml doesn’t accept values in range from�toinside attributes allow#x7fto¡. trigger kind of error in parser :

parser error : xmlparsecharref: invalid xmlchar value 18 <glyph glyph-name="uni00000f" unicode="&#x12;"                                        ^

i tried opening file in several web browsers , got similar error messages same lines.
couldn’t find in standard purpose of behaviour. seems escaped unicode control characters allowed.

so know reason of design ?
there alternative defining , using glyphs outside svg file ?


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