Comment 1 for bug 1029033

Steps to reproduce vary (testing with r11573 on OS X 10.7.4) - corruption mostly occurs after repeated edits of a guide's label (inserting characters seems to trigger the error more often than adding characters at the end), sometimes may produce broken SVG file which Inkscape can no longer reopen:

/path/to/bug/1029033-labeled-guide-1.svg:44: parser error : invalid character in attribute value
       inkscape:label="foobar" />
                             ^
/path/to/bug/1029033-labeled-guide-1.svg:44: parser error : attributes construct error
       inkscape:label="foobar" />
                             ^
/path/to/bug/1029033-labeled-guide-1.svg:44: parser error : Couldn't find end of Start Tag guide line 40
       inkscape:label="foobar" />
                             ^
/path/to/bug/1029033-labeled-guide-1.svg:44: parser error : PCDATA invalid Char value 2
       inkscape:label="foobar" />
                             ^