<dependency>
  <groupId>com.google.appengine</groupId>
  <artifactId>proto1</artifactId>
  <version>0.1</version>
</dependency>

implementation 'com.google.appengine:proto1:0.1'

implementation("com.google.appengine:proto1:0.1")

libraryDependencies += "com.google.appengine" % "proto1" % "0.1"

@Grapes(
  @Grab(group='com.google.appengine', module='proto1', version='0.1')
)

<dependency org="com.google.appengine" name="proto1" rev="0.1" />

[com.google.appengine/proto1 "0.1"]

'com.google.appengine:proto1:jar:0.1'