From 59d41a9cb3b3b938aef8ce18f8adc666fca49dc5 Mon Sep 17 00:00:00 2001
From: Alan Bernstein <alan.aaron.bernstein@gmail.com>
Date: Wed, 21 Feb 2018 15:42:46 -0600
Subject: [PATCH] Add Xor to docs

---
 docs/query-language.md | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/docs/query-language.md b/docs/query-language.md
index 0e02351ab..b1315d293 100644
--- a/docs/query-language.md
+++ b/docs/query-language.md
@@ -52,7 +52,7 @@ curl localhost:10101/index/repository/query \
 * `UINT` An unsigned integer (e.g. 42839)
 * `ATTR_NAME` Must be a valid identifier `[A-Za-z][A-Za-z0-9._-]*`
 * `ATTR_VALUE` Can be a string, float, integer, or bool.
-* `BITMAP_CALL` Any query which returns a bitmap, such as `Bitmap`, `Union`, `Difference`, `Intersect`, `Range`
+* `BITMAP_CALL` Any query which returns a bitmap, such as `Bitmap`, `Union`, `Difference`, `Xor`, `Intersect`, `Range`
 * `[]ATTR_VALUE` Denotes an array of `ATTR_VALUE`s. (e.g. `["a", "b", "c"]`)
 
 ### Write Operations
@@ -308,6 +308,28 @@ Return `{"attrs":{},"bits":[30]}`
 
 * Bits are repositories that were starred by user 2 BUT NOT user 1
 
+#### Xor
+
+**Description:**
+
+Xor performs a logical XOR on the results of each `BITMAP_CALL` query passed to it.
+
+**Result Type:** object with attrs and bits
+
+attrs will always be empty
+
+**Examples:**
+
+Query repositories which have been starred by two users.
+
+```
+Xor(Bitmap(frame="stargazer", rowID=1), Bitmap(frame="stargazer", rowID=2))
+```
+
+Returns `{"attrs":{},"bits":[30]}`.
+
+* bits are repositories that were starred by user 1 XOR user 2 (user 1 or user 2, but not both)
+
 #### Count
 **Spec:**