/usr/share/pgmodeler/schemas/xml/label.sch is in pgmodeler-common 0.9.1~beta-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # XML definition for relationship label positioning
# CAUTION: Do not modify this file unless you know what you are doing.
# Code generation can be broken if incorrect changes are made.
$tb <label [ ref-type=] "{ref-type}"> $br
$tb {position}
$tb </label> $br
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