update

README.md

@@ -604,6 +604,7 @@ You can enable the following middleware using the "middlewares" config parameter
 - "pageLimits": Restricts list operations to prevent database scraping
 - "joinLimits": Restricts join parameters to prevent database scraping
 - "customization": Provides handlers for request and response customization
+- "xml": Translates all input and output from JSON to XML
 
 The "middlewares" config parameter is a comma separated list of enabled middlewares.
 You can tune the middleware behavior using middleware specific configuration parameters:
@@ -667,6 +668,7 @@ You can tune the middleware behavior using middleware specific configuration par
 - "joinLimits.records": The maximum number of records returned for a joined entity ("1000")
 - "customization.beforeHandler": Handler to implement request customization ("")
 - "customization.afterHandler": Handler to implement response customization ("")
+- "xml.objectElement": The XML element name to use for objects ("object")
 
 If you don't specify these parameters in the configuration, then the default values (between brackets) are used.
 
@@ -1036,6 +1038,18 @@ You may use the "customization" middleware to modify request and response and im
 
 The above example will add a header "X-Time-Taken" with the number of seconds the API call has taken.
 
+### XML middleware
+
+You may use the "xml" middleware to translate input and output from JSON to XML. This request:
+
+    GET /records/posts/1?format=xml
+
+Gives this outputs (it uses a "format" query parameter):
+
+    <object><id>1</id><user_id>1</user_id><category_id>1</category_id><content>blog started</content></object>
+
+This functionality is disabled by default and must be enabled using the "middlewares" configuration setting.
+
 ### File uploads
 
 File uploads are supported through the [FileReader API](https://caniuse.com/#feat=filereader), check out the [example](https://github.com/mevdschee/php-crud-api/blob/master/examples/clients/upload/vanilla.html).