Loco supports Java properties and Java XML properties
Properties files
Loco treats files with the extension .properties
as Java properties and will import translations as simple key/value pairs accordingly.
See wikipedia.org/wiki/.properties
XML properties
The XML version of this format doesn't have its own file extension, but Loco's XML parser will recognize a Java Properties XML file and import the translations as above.
See java.sun.com/dtd/properties.dtd
Android SDK
For importing Android strings, see Loco's full support for Android XML format.