--- /dev/null
+Expand unAPI API
+^^^^^^^^^^^^^^^^
+Evergreen's unAPI support now includes access to many more
+record types. For example, the following URL would fetch
+bib 267 in MODS32 along with holdings, volume, copy,
+and record attribute information:
+
+https://example.org/opac/extras/unapi?id=tag::U2@bre/267{holdings_xml,acn,acp,mra}&format=mods32
+
+To access the new unAPI features, the unAPI ID should have the
+following form:
+
+ * +tag::U2@+
+ * followed by class name, which may be
+ * +bre+ (bibs)
+ * +biblio_record_entry_feed+ (multiple bibs)
+ * +acl+ (copy locations)
+ * +acn+ (volumes)
+ * +acnp+ (call number prefixes)
+ * +acns+ (call number suffixes)
+ * +acp+ (copies)
+ * +acpn+ (copy notes)
+ * +aou+ (org units)
+ * +ascecm+ (copy stat cat entries)
+ * +auri+ (located URIs)
+ * +bmp+ (monographic parts)
+ * +cbs+ (bib sources)
+ * +ccs+ (copy statuses)
+ * +circ+ (loan checkout and due dates)
+ * +holdings_xml+ (holdings)
+ * +mmr+ (metarecords)
+ * +mmr_holdings_xml+ (metarecords with holdings)
+ * +mmr_mra+ (metarecords with record attributes)
+ * +mra+ (record attributes)
+ * +sbsum+ (serial basic summaries)
+ * +sdist+ (serial distributions)
+ * +siss+ (serial issues)
+ * +sisum+ (serial index summaries)
+ * +sitem+ (serial items)
+ * +sssum+ (serial supplement summaries)
+ * +sstr+ (serial streams)
+ * +ssub+ (serial subscriptions)
+ * +sunit+ (serial units)
+ * followed by +/+
+ * followed by a record identifier (or in the case of
+ the +biblio_record_entry_feed+ class, multiple IDs separated
+ by commas)
+ * followed, optionally, by limit and offset in square brackets
+ * followed, optionally, by a comma-separated list of "includes"
+ enclosed in curly brackets. The list list of includes is
+ the same as the list of classes with the following addition:
+ * +bre.extern+ (information from the non-MARC parts of a bib
+ record)
+ * followed, optionally, by +/+ and org unit; "-" signifies
+ the top of the org unit tree
+ * followed, optionally, by +/+ and org unit depth
+ * followed, optionally, by +/+ and a path. If the path
+ is +barcode+ and the class is +acp+, the record ID is taken
+ to be a copy barcode rather than a copy ID; for example, in
+ +tag::U2@acp/ACQ140{acn,bre,mra}/-/0/barcode+, +ACQ140+ is
+ meant to be a copy barcode.