+
+
+h3. provenance
+
+Returns a list of objects in the database that directly or indirectly contributed to producing this collection, such as the container request that produced this collection as output.
+
+The general algorithm is:
+
+# Visit the container request that produced this collection (via @output_uuid@ or @log_uuid@ attributes of the container request)
+# Visit the input collections to that container request (via @mounts@ and @container_image@ of the container request)
+# Iterate until there are no more objects to visit
+
+Arguments:
+
+table(table table-bordered table-condensed).
+|_. Argument |_. Type |_. Description |_. Location |_. Example |
+{background:#ccffcc}.|uuid|string|The UUID of the Collection to get provenance.|path||
+
+h3. used_by
+
+Returns a list of objects in the database this collection directly or indirectly contributed to, such as containers that takes this collection as input.
+
+The general algorithm is:
+
+# Visit containers that take this collection as input (via @mounts@ or @container_image@ of the container)
+# Visit collections produced by those containers (via @output@ or @log@ of the container)
+# Iterate until there are no more objects to visit
+
+Arguments:
+
+table(table table-bordered table-condensed).
+|_. Argument |_. Type |_. Description |_. Location |_. Example |
+{background:#ccffcc}.|uuid|string|The UUID of the Collection to get usage.|path||
+
+h2(#replace_files). Using "replace_files" to create/update collections
+
+The @replace_files@ option can be used with the @create@ and @update@ APIs to efficiently copy individual files and directory trees from other collections, and copy/rename/delete items within an existing collection, without transferring any file data.
+
+@replace_files@ keys indicate target paths in the new collection, and values specify sources that should be copied to the target paths.
+* Each target path must be an absolute canonical path beginning with @/@. It must not contain @.@ or @..@ components, consecutive @/@ characters, or a trailing @/@ after the final component.
+* Each source must be either an empty string (signifying that the target path is to be deleted), or @PDH/path@ where @PDH@ is the portable data hash of a collection on the cluster and @/path@ is a file or directory in that collection.
+* In an @update@ request, sources may reference the current portable data hash of the collection being updated.
+
+Example: delete @foo.txt@ from a collection
+
+<notextile><pre>
+"replace_files": {
+ "/foo.txt": ""
+}
+</pre></notextile>
+
+Example: rename @foo.txt@ to @bar.txt@ in a collection with portable data hash @fa7aeb5140e2848d39b416daeef4ffc5+45@
+
+<notextile><pre>
+"replace_files": {
+ "/foo.txt": "",
+ "/bar.txt": "fa7aeb5140e2848d39b416daeef4ffc5+45/foo.txt"
+}
+</pre></notextile>
+
+Example: delete current contents, then add content from multiple collections
+
+<notextile><pre>
+"replace_files": {
+ "/": "",
+ "/copy of collection 1": "1f4b0bc7583c2a7f9102c395f4ffc5e3+45/",
+ "/copy of collection 2": "ea10d51bcf88862dbcc36eb292017dfd+45/"
+}
+</pre></notextile>
+
+Example: replace entire collection with a copy of a subdirectory from another collection
+
+<notextile><pre>
+"replace_files": {
+ "/": "1f4b0bc7583c2a7f9102c395f4ffc5e3+45/subdir"
+}
+</pre></notextile>
+
+A target path with a non-empty source cannot be the ancestor of another target path in the same request. For example, the following request is invalid:
+
+<notextile><pre>
+"replace_files": {
+ "/foo": "fa7aeb5140e2848d39b416daeef4ffc5+45/",
+ "/foo/this_will_return_an_error": ""
+}
+</pre></notextile>