Enable excel in public swagger

specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Dataset.json

@@ -593,6 +593,56 @@
         "location"
       ]
     },
+    "ExcelDataset": {
+      "x-ms-discriminator-value": "Excel",
+      "description": "Excel dataset.",
+      "type": "object",
+      "allOf": [
+        {
+          "$ref": "#/definitions/Dataset"
+        }
+      ],
+      "properties": {
+        "typeProperties": {
+          "description": "Excel dataset properties.",
+          "x-ms-client-flatten": true,
+          "$ref": "#/definitions/ExcelDatasetTypeProperties"
+        }
+      }
+    },
+    "ExcelDatasetTypeProperties": {
+      "description": "Excel dataset properties.",
+      "properties": {
+        "location": {
+          "$ref": "#/definitions/DatasetLocation",
+          "description": "The location of the excel storage."
+        },
+        "sheetName": {
+          "type": "object",
+          "description": "The sheet of excel file. Type: string (or Expression with resultType string)."
+        },
+        "range": {
+          "type": "object",
+          "description": "The partial data of one sheet. Type: string (or Expression with resultType string)."
+        },
+        "firstRowAsHeader": {
+          "type": "object",
+          "description": "When used as input, treat the first row of data as headers. When used as output,write the headers into the output as the first row of data. The default value is false. Type: boolean (or Expression with resultType boolean)."
+        },
+        "compression": {
+          "description": "The data compression method used for the json dataset.",
+          "$ref": "#/definitions/DatasetCompression"
+        },
+        "nullValue": {
+          "type": "object",
+          "description": "The null value string. Type: string (or Expression with resultType string)."
+        }
+      },
+      "required": [
+        "location",
+        "sheetName"
+      ]
+    },
     "ParquetDataset": {
       "x-ms-discriminator-value": "Parquet",
       "description": "Parquet dataset.",

specification/datafactory/resource-manager/Microsoft.DataFactory/stable/2018-06-01/entityTypes/Pipeline.json

@@ -1018,6 +1018,28 @@
         }
       }
     },
+    "ExcelSource": {
+      "description": "A copy activity excel source.",
+      "type": "object",
+      "allOf": [
+        {
+          "$ref": "#/definitions/CopySource"
+        }
+      ],
+      "properties": {
+        "storeSettings": {
+          "$ref": "#/definitions/StoreReadSettings",
+          "description": "Excel store settings."
+        },
+        "additionalColumns": {
+          "type": "array",
+          "description": "Specifies the additional columns to be added to source data. Type: array of objects (or Expression with resultType array of objects).",
+          "items": {
+            "$ref": "#/definitions/AdditionalColumns"
+          }
+        }
+      }
+    },
     "ParquetSource": {
       "description": "A copy activity Parquet source.",
       "type": "object",