Java Properties - Data notation

Java Properties is a data notation created in 1995.

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.properties is a file extension for files mainly used in Java related technologies to store the configurable parameters of an application. They can also be used for storing strings for Internationalization and localization; these are known as Property Resource Bundles. Each parameter is stored as a pair of strings, one storing the name of the parameter (called the key), and the other storing the value.. Read more on Wikipedia...

Tags: dataNotation
There are at least 6,363 Java Properties repos on GitHub
Early development of Java Properties happened in Oracle
GitHub supports syntax highlighting for Java Properties
See also: (10 related languages) Java, Unicode, Microsoft Notepad, Emacs, Vim, ASCII, Eclipse, Perl, XML, YAML

Example from Linguist:

#
# Licensed under the Apache License, Version 2.0 (the "License"); you
# may not use this file except in compliance with the License.  You may
# obtain a copy of the License at
#
#	http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.  See the License for the specific language governing
# permissions and limitations under the License.
#
Dink:net/rptools/maptool/client/sound/dink.mp3
Clink:net/rptools/maptool/client/sound/clink.mp3

Example from Wikipedia:

# You are reading the ".properties" entry.
! The exclamation mark can also mark text as comments.
# The key characters =, and : should be written with
# a preceding backslash to ensure that they are properly loaded.
# However, there is no need to precede the value characters =, and : by a backslash.
website = https://en.wikipedia.org/
language = English
# The backslash below tells the application to continue reading
# the value onto the next line.
message = Welcome to \
          Wikipedia!
# Add spaces to the key
key\ with\ spaces = This is the value that could be looked up with the key "key with spaces".
# Unicode
tab : \u0009
# If you want your property to include a backslash, it should be escaped by another backslash
path=c:\\wiki\\templates
# However, some editors will handle this automatically

Language features

Feature	Supported	Example	Token
Comments	✓	# A comment
Line Comments	✓	# A comment	#
Semantic Indentation	X