Subversion has the ability to substitute keywords—pieces of useful, dynamic information about a versioned file—into the contents of the file itself. Keywords generally provide information about the last modification made to the file. Because this information changes each time the file changes, and more importantly, just after the file changes, it is a hassle for any process except the version control system to keep the data completely up to date. Left to human authors, the information would inevitably grow stale.
For example, say you have a document in which you would like to
display the last date on which it was modified. You could burden every
author of that document to, just before committing their changes, also
tweak the part of the document that describes when it was last changed.
But sooner or later, someone would forget to do that. Instead, simply ask
Subversion to perform keyword substitution on the
LastChangedDate keyword. You control where the
keyword is inserted into your document by placing a keyword
anchor at the desired location in the file. This anchor is just a
string of text formatted as
All keywords are case-sensitive where they appear as anchors in files: you must use the
correct capitalization for the keyword to be expanded. You should consider
the value of the
property to be case-sensitive, too—certain keyword names will be
recognized regardless of case, but this behavior is deprecated.
Subversion defines the list ...