as requested from developer,he has given accessibility identifier to signin button and name given is = signinbutton
?xml version="1.0" encoding="UTF-8"?>
AppiumAUT>
UIAApplication name="Kitaboo" label="Kitaboo" value="" dom="" enabled="true" valid="true" visible="true" hint="" path="/0" x="0" y="0" width="768" height="1024">
UIAWindow name="" label="" value="" dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0" x="0" y="0" width="768" height="1024">
UIAButton name="3" label="3" value="" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/0" x="8" y="4" width="40" height="40">
UIAStaticText name="3" label="3" value="3" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/0/0" x="8" y="8" width="32" height="32">
/UIAStaticText>
/UIAButton>
UIAImage name="Kitaboo_logo.png" label="" value="" dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/1" x="264" y="1.5" width="240" height="40">
/UIAImage>
UIAButton name="d" label="d" value="" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/2" x="614" y="4" width="40" height="40">
UIAStaticText name="d" label="d" value="d" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/2/0" x="622" y="12" width="24" height="24">
/UIAStaticText>
/UIAButton>
UIATextField name="" label="" value="Search by Author, Title & ISBN" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/3" x="438" y="52" width="230" height="29">
/UIATextField>
UIAStaticText name="ľ" label="ľ" value="ľ" dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/4" x="720" y="4" width="40" height="40">
/UIAStaticText>
UIAImage name="" label="" value="" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/5" x="720" y="4" width="40" height="40">
/UIAImage>
UIAButton name="+" label="+" value="" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/6" x="720" y="4" width="40" height="40">
UIAStaticText name="+" label="+" value="+" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/6/0" x="728" y="8" width="32" height="32">
/UIAStaticText>
/UIAButton>
UIATextField name="" label="" value="Search by Author, Title & ISBN" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/7" x="457" y="53" width="249" height="30">
/UIATextField>
UIAButton name="d" label="d" value="" dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/8" x="714" y="53" width="46" height="30">
/UIAButton>
UIATableView name="Empty list" label="Empty list" value="" dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/9" x="0" y="88" width="768" height="907">
/UIATableView>
UIAStaticText name="" label="" value="" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/10" x="384" y="498.5" width="0" height="0">
/UIAStaticText>
UIAButton name="˛" label="˛" value="" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/11" x="4" y="4" width="40" height="40">
UIAStaticText name="˛" label="˛" value="˛" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/11/0" x="4" y="8" width="32" height="32">
/UIAStaticText>
/UIAButton>
UIAImage name="Kitaboo_logo.png" label="" value="" dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/12" x="264" y="4" width="240" height="40">
/UIAImage>
UIAStaticText name="Sign in" label="Sign in" value="Sign in" dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/13" x="194" y="214" width="380" height="36">
/UIAStaticText>
UIAStaticText name="Sign in to your Kitaboo account to experience the digital eBooks." label="Sign in to your Kitaboo account to experience the digital eBooks." value="Sign in to your Kitaboo account to experience the digital eBooks." dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/14" x="194" y="258" width="380" height="41">
/UIAStaticText>
UIAStaticText name="Sign in" label="Sign in" value="Sign in" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/15" x="196" y="267" width="91" height="40">
/UIAStaticText>
UIATextField name="" label="" value="Email ID" dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/16" x="204" y="314" width="370" height="36">
/UIATextField>
UIASecureTextField name="" label="" value="Password" dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/17" x="204" y="353" width="370" height="36">
UIAButton name="©" label="©" value="1" dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/17/0" x="522" y="345" width="52" height="52">
/UIAButton>
/UIASecureTextField>
UIAButton name="Sign in" label="Sign in" value="" dom="" enabled="false" valid="true" visible="true" hint="" path="/0/0/18" x="194" y="401" width="380" height="40">
/UIAButton>
UIAButton name="Forgot Password?" label="Forgot Password?" value="" dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/19" x="308" y="453" width="266" height="40">
/UIAButton>
UIAStaticText name="No account ?" label="No account ?" value="No account ?" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/20" x="308" y="501" width="153" height="21">
/UIAStaticText>
UIAButton name="SIGN UP" label="SIGN UP" value="" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/21" x="196" y="524" width="378" height="40">
UIAStaticText name="SIGN UP" label="SIGN UP" value="SIGN UP" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/21/0" x="342" y="531" width="86" height="26">
/UIAStaticText>
/UIAButton>
UIAStaticText name="---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------" label="---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------" value="---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------" dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/22" x="-126" y="592" width="1020" height="12">
/UIAStaticText>
UIAStaticText name="SAPLING_LEARNING_TYPE" label="SAPLING_LEARNING_TYPE" value="SAPLING_LEARNING_TYPE" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/23" x="174" y="226" width="420" height="21">
/UIAStaticText>
UIAStaticText name="" label="" value="" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/24" x="193" y="548" width="380" height="1">
/UIAStaticText>
UIAStaticText name="No Access data?" label="No Access data?" value="No Access data?" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/25" x="194" y="618" width="380" height="16">
/UIAStaticText>
UIATextField name="" label="" value="Enter your e-mail ID" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/26" x="204" y="641" width="330" height="40">
/UIATextField>
UIAButton name="" label="" value="" dom="" enabled="false" valid="true" visible="false" hint="" path="/0/0/27" x="542" y="641" width="40" height="41">
UIAStaticText name="" label="" value="" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/27/0" x="542" y="641" width="0" height="0">
/UIAStaticText>
/UIAButton>
UIAStaticText name="Have an Access Code?" label="Have an Access Code?" value="Have an Access Code?" dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/28" x="194" y="610" width="380" height="36">
/UIAStaticText>
UIAStaticText name="Use access code to view the eBooks." label="Use access code to view the eBooks." value="Use access code to view the eBooks." dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/29" x="194" y="654" width="380" height="44">
/UIAStaticText>
UIATextField name="" label="" value="Access Code" dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/30" x="204" y="708" width="330" height="36">
/UIATextField>
UIAButton name="¤" label="¤" value="" dom="" enabled="false" valid="true" visible="true" hint="" path="/0/0/31" x="534" y="706" width="40" height="40">
/UIAButton>
UIATableView name="" label="" value="moved to row 1 of 1" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/32" x="-240" y="50" width="240" height="860">
UIATableCell name="" label="" value="" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/32/0" x="-240" y="50" width="240" height="40">
UIAStaticText name="" label="" value="" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/32/0/0" x="-220" y="55" width="24.5" height="30">
/UIAStaticText>
UIAStaticText name="All Items" label="All Items" value="All Items" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/32/0/1" x="-190.5" y="50" width="175.5" height="40">
/UIAStaticText>
/UIATableCell>
/UIATableView>
UIAImage name="profile_pic.png" label="" value="" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/33" x="-232" y="61" width="60" height="60">
/UIAImage>
UIAStaticText name="Guest user" label="Guest user" value="Guest user" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/34" x="-167" y="61" width="143" height="60">
/UIAStaticText>
UIAStaticText name="B" label="B" value="B" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/35" x="-232" y="920" width="40" height="40">
/UIAStaticText>
UIAButton name="Profile Settings" label="Profile Settings" value="" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/36" x="-232" y="920" width="224" height="40">
UIAStaticText name="Profile Settings" label="Profile Settings" value="Profile Settings" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/36/0" x="-177.5" y="929.5" width="115.5" height="21.5">
/UIAStaticText>
/UIAButton>
UIAButton name="Sign Out" label="Sign Out" value="" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/37" x="-232" y="976" width="224" height="40">
UIAStaticText name="Sign Out" label="Sign Out" value="Sign Out" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/0/37/0" x="-154" y="985.5" width="68" height="21.5">
/UIAStaticText>
/UIAButton>
UIAStaticText name="Powered by " label="Powered by " value="Powered by " dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/38" x="620" y="1005" width="59" height="12">
/UIAStaticText>
UIAStaticText name="Ù" label="Ù" value="Ù" dom="" enabled="true" valid="true" visible="true" hint="" path="/0/0/39" x="679" y="993.5" width="81" height="29">
/UIAStaticText>
/UIAWindow>
UIAWindow name="" label="" value="" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/1" x="0" y="0" width="768" height="1024">
UIAStatusBar name="" label="" value="" dom="" enabled="true" valid="true" visible="false" hint="" path="/0/1/0" x="0" y="0" width="768" height="20">
UIAElement name="iPad" label="iPad" value="" dom="" enabled="true" valid="true" visible="false" hint="Swipe down with three fingers to reveal the notification center., Swipe up with three fingers to reveal the control center, Double-tap to scroll to top" path="/0/1/0/0" x="6" y="0" width="25" height="20">
/UIAElement>
UIAElement name="3 of 3 Wi-Fi bars" label="3 of 3 Wi-Fi bars" value="HSPUNEDEV" dom="" enabled="true" valid="true" visible="false" hint="Swipe down with three fingers to reveal the notification center., Swipe up with three fingers to reveal the control center, Double-tap to scroll to top" path="/0/1/0/1" x="36" y="0" width="13" height="20">
/UIAElement>
UIAElement name="19:11" label="19:11" value="" dom="" enabled="true" valid="true" visible="false" hint="Swipe down with three fingers to reveal the notification center., Swipe up with three fingers to reveal the control center, Double-tap to scroll to top" path="/0/1/0/2" x="371" y="0" width="27" height="20">
/UIAElement>
UIAElement name="97% battery power, Charging" label="97% battery power, Charging" value="" dom="" enabled="true" valid="true" visible="false" hint="Swipe down with three fingers to reveal the notification center., Swipe up with three fingers to reveal the control center, Double-tap to scroll to top" path="/0/1/0/3" x="701" y="0" width="62" height="20">
/UIAElement>
/UIAStatusBar>
/UIAWindow>
/UIAApplication>
/AppiumAUT>