No maximum length was specified for the output column "" with external data type System.String. The SSIS Data Flow Task data type "DT_WSTR" with a length of 255 will be used.

In SSIS when we will use data source as XML Source and if will generate a XSD file and click on Mapping tab or OK button we may get warning message like:

No maximum length was specified for the output column "" with external data type System.String. The SSIS Data Flow Task data type "DT_WSTR" with a length of 255 will be used.

Cause: In your XSD file either generated by SSIS or created by you, doesn't specify the max length of XML tag or attribute of type string. So SSIS use default value that is 255.

Solution:

1. If max length of string i.e. 255 is sufficient for you then click on OK button.

2. If you want increase or decrease the max of string then you have to edit your .xsd file as follow:

Replace the each element and specify minLenght and maxLength according to your requirement:

Initially:

<xs:element minOccurs="0" name="phone" type="xs:string" />

Now:

<xs:element minOccurs="0" name="phone" >

     <xs:simpleType>

          <xs:restriction base="xs:string">

              <xs:minLength value="0"/>

              <xs:maxLength value="4000"/>

          </xs:restriction>

     </xs:simpleType>

</xs:element>

Note: Change the name = "phone" attribute to your element name.