How to let xmlrpc go through WAF's checking

Hi all,
I think this question is easy to programmer,i can not post it on code layout. So i post it at here. Thanks.

Background:
I have a wordpress blog site beyond F5’s web application firewall(named ASM),there is a function that define xml profile to protect xml traffic.

I use wordpress client on ipad to access the blog,but i found the xml post request was denied by F5 ASM as i never define any xml profile before on ASM,so ASM treat the post as normal data and reported there are illegal meta character in post content (eg. <” etc.). So now,i must go to define the xml profile,but in ASM xml profile setting page,it need me upload a schema of xml. How can i get the schema of wordpress? Or any idea on setting this function. Very very thanks.

Below are the post data that from wordpress client.

POST /xmlrpc.php HTTP/1.1
Host: www.****.net
User-Agent: wp-iphone/2.6.1
Content-Type: text/xml
Content-Length: 263
Accept: */*
Accept-Language: zh-cn
Accept-Encoding: gzip, deflate
Connection: keep-alive

<?xml version=”1.0″?><methodCall><methodName>wp.getPageStatusList</methodName><params><param><value><string>1</string></value></param><param><value><string>admin</string></value></param><param><value><string>password</string></value></param></params></methodCall>

Here is the screen snapshot of ASM xml profile setting:
http://www.myf5.net/upload/2010/10/xmlprofile.jpg