Golang xml doesn't unmarshal

Im trying to unmarshal the following code that has the go playground at the bottom. The data.DocumentType always returns 0 and should return the inner xml 4. Can someone tell me why this doesnt work?

package main
import (
"encoding/xml"
"fmt"
)
type doc struct {
XMLName       xml.Name `xml:"ownershipDocument"`
SchemaVersion string   `xml:",innerxml"`
DocumentType  int      `xml:",innerxml"`
}
func main() {
var Data doc
xml.Unmarshal([]byte(VV), &Data)
fmt.Println(Data.DocumentType)
}
const VV = `<?xml version="1.0"?>
<ownershipDocument>
<schemaVersion>X0306</schemaVersion>
<documentType>4</documentType>
<periodOfReport>2015-11-18</periodOfReport>
<issuer>
<issuerCik>0000820081</issuerCik>
<issuerName>CAMBREX CORP</issuerName>
<issuerTradingSymbol>CBM</issuerTradingSymbol>
</issuer>
<reportingOwner>
<reportingOwnerId>
<rptOwnerCik>0001227832</rptOwnerCik>
<rptOwnerName>KORB WILLIAM B</rptOwnerName>
</reportingOwnerId>
<reportingOwnerAddress>
<rptOwnerStreet1>1 MEADOWLANDS PLAZA</rptOwnerStreet1>
<rptOwnerStreet2></rptOwnerStreet2>
<rptOwnerCity>EAST RUTHERFORD</rptOwnerCity>
<rptOwnerState>NJ</rptOwnerState>
<rptOwnerZipCode>07073</rptOwnerZipCode>
<rptOwnerStateDescription></rptOwnerStateDescription>
</reportingOwnerAddress>
<reportingOwnerRelationship>
<isDirector>1</isDirector>
<isOfficer>0</isOfficer>
<isTenPercentOwner>0</isTenPercentOwner>
<isOther>0</isOther>
</reportingOwnerRelationship>
</reportingOwner>
<nonDerivativeTable>
<nonDerivativeTransaction>
<securityTitle>
<value>Common Stock</value>
</securityTitle>
<transactionDate>
<value>2015-11-18</value>
</transactionDate>
<transactionCoding>
<transactionFormType>4</transactionFormType>
<transactionCode>S</transactionCode>
<equitySwapInvolved>0</equitySwapInvolved>
</transactionCoding>
<transactionAmounts>
<transactionShares>
<value>10000</value>
</transactionShares>
<transactionPricePerShare>
<value>50.18</value>
<footnoteId id="F1"/>
</transactionPricePerShare>
<transactionAcquiredDisposedCode>
<value>D</value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value>36562</value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value>
</directOrIndirectOwnership>
<natureOfOwnership>
<value></value>
</natureOfOwnership>
</ownershipNature>
</nonDerivativeTransaction>
</nonDerivativeTable>
<footnotes>
<footnote id="F1">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $50.00 to $50.58 inclusive. The reporting person undertakes to provide to Cambrex Corporation, any security holder of Cambrex Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this Footnote 1 to this Form 4.</footnote>
</footnotes>
<remarks></remarks>
<ownerSignature>
<signatureName>Samantha Hanley for William B. Korb by POA</signatureName>
<signatureDate>2015-11-20</signatureDate>
</ownerSignature>
</ownershipDocument>`

http://play.golang.org/p/nJbAF0zKSJ

Remove the innerxml tag on DocumentType, and give it the name of the element to to match (xml:"documentType"). From the xml library docs:

>If the struct has a field of type []byte or string with tag ",innerxml", Unmarshal accumulates the raw XML nested inside the element in that field. The rest of the rules still apply.

You don't need to store unprocessed XML. You're looking for the value of the field, so you don't need the tag.

Working version

*edit: For that matter, the ",innerxml" tag will also break the SchemaVersion field as well—without a matching element (and since SchemaVersion is a string), it stores the whole document.

I tried to do as much i could please suggest and help . 
I use this method please comment and suggest.  
https://play.golang.org/p/kb0HF8ykHW
package main;
import (
"fmt"
"encoding/xml"	
)
func main(){
dxml := `
<?xml version="1.0"?>
<ownershipDocument>
<schemaVersion>X0306</schemaVersion>
<documentType>4</documentType>
<periodOfReport>2015-11-18</periodOfReport>
<issuer>
<issuerCik>0000820081</issuerCik>
<issuerName>CAMBREX CORP</issuerName>
<issuerTradingSymbol>CBM</issuerTradingSymbol>
</issuer>
<reportingOwner>
<reportingOwnerId>
<rptOwnerCik>0001227832</rptOwnerCik>
<rptOwnerName>KORB WILLIAM B</rptOwnerName>
</reportingOwnerId>
<reportingOwnerAddress>
<rptOwnerStreet1>1 MEADOWLANDS PLAZA</rptOwnerStreet1>
<rptOwnerStreet2/>
<rptOwnerCity>EAST RUTHERFORD</rptOwnerCity>
<rptOwnerState>NJ</rptOwnerState>
<rptOwnerZipCode>07073</rptOwnerZipCode>
<rptOwnerStateDescription/>
</reportingOwnerAddress>
<reportingOwnerRelationship>
<isDirector>1</isDirector>
<isOfficer>0</isOfficer>
<isTenPercentOwner>0</isTenPercentOwner>
<isOther>0</isOther>
</reportingOwnerRelationship>
</reportingOwner>
<nonDerivativeTable>
<nonDerivativeTransaction>
<securityTitle>
<value>Common Stock</value>
</securityTitle>
<transactionDate>
<value>2015-11-18</value>
</transactionDate>
<transactionCoding>
<transactionFormType>4</transactionFormType>
<transactionCode>S</transactionCode>
<equitySwapInvolved>0</equitySwapInvolved>
</transactionCoding>
<transactionAmounts>
<transactionShares>
<value>10000</value>
</transactionShares>
<transactionPricePerShare>
<value>50.18</value>
<footnoteId id="F1"/>
</transactionPricePerShare>
<transactionAcquiredDisposedCode>
<value>D</value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value>36562</value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value>
</directOrIndirectOwnership>
<natureOfOwnership>
<value/>
</natureOfOwnership>
</ownershipNature>
</nonDerivativeTransaction>
</nonDerivativeTable>
<footnotes>
<footnote id="F1">The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $50.00 to $50.58 inclusive. The reporting person undertakes to provide to Cambrex Corporation, any security holder of Cambrex Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this Footnote 1 to this Form 4.</footnote>
</footnotes>
<remarks/>
<ownerSignature>
<signatureName>Samantha Hanley for William B. Korb by POA</signatureName>
<signatureDate>2015-11-20</signatureDate>
</ownerSignature>
</ownershipDocument>
`
defer func() {
if errD := recover(); errD != nil {
fmt.Println("!!!!!!!!!!!!!!!!Panic Occured and Recovered in func main(), Error Info: ", errD)
}
}()
var Owner Ownershipdocs 
err := xml.Unmarshal([]byte(dxml), &Owner)
fmt.Println("xml.unmarshal error info :",err)
fmt.Println("SchemaVersion : ",Owner.SchemaVersion)
fmt.Println("DocumentType : ",Owner.DocumentType)
fmt.Println("PeriodOfReport : ",Owner.PeriodOfReport)
fmt.Println("IssuerCik : ",Owner.IssuerCik)
fmt.Println("IssuerName : ",Owner.IssuerName)
fmt.Println("IssuerTradingSymbol : ",Owner.IssuerTradingSymbol)
fmt.Println("RptOwnerCik : ",Owner.RptOwnerCik)
fmt.Println("RptOwnerName : ",Owner.RptOwnerName)
fmt.Println("RptOwnerStreet1 : ",Owner.RptOwnerStreet1)
fmt.Println("RptOwnerCity :  ",Owner.RptOwnerCity)
fmt.Println("RptOwnerState : ",Owner.RptOwnerState)
fmt.Println("RptOwnerZipCode : ",Owner.RptOwnerZipCode)
fmt.Println("IsDirector	: ",Owner.IsDirector)	
fmt.Println("IsOfficer :  ",Owner.IsOfficer)
fmt.Println("IsTenPercentOwner : ",Owner.IsTenPercentOwner)
fmt.Println("IsOther : ",Owner.IsOther)
fmt.Println("SecurityTitleValue : ",Owner.SecurityTitleValue)
fmt.Println("TransactionDatevalue : ",Owner.TransactionDatevalue)
fmt.Println("TransactionFormType : ",Owner.TransactionFormType)
fmt.Println("TransactionCode : ",Owner.TransactionCode)
fmt.Println("EquitySwapInvolved : ",Owner.EquitySwapInvolved)
fmt.Println("TransactionSharesValue : ",Owner.TransactionSharesValue)
fmt.Println("TransactionPricePerShareValue : ",Owner.TransactionPricePerShareValue)
fmt.Println("TransactionPricePerSharefootnoteId :  ",Owner.TransactionPricePerSharefootnoteId)
fmt.Println("TransactionAcquiredDisposedCodeValue : ",Owner.TransactionAcquiredDisposedCodeValue)
fmt.Println("Footnote.Footnote : ",Owner.Footnote.Footnote)
fmt.Println("OwnerSignaturesignatureName : ",Owner.OwnerSignaturesignatureName)
fmt.Println("OwnerSignaturesignatureDate	: ",Owner.OwnerSignaturesignatureDate)	
}
type Ownershipdocs struct{
SchemaVersion  			string `xml:"schemaVersion"`
DocumentType   			string `xml:"documentType"`
PeriodOfReport 			string `xml:"periodOfReport"`
IssuerCik				string `xml:"issuer>issuerCik"`
IssuerName				string `xml:"issuer>issuerName"`
IssuerTradingSymbol		string `xml:"issuer>issuerTradingSymbol"`
RptOwnerCik				string `xml:"reportingOwner>reportingOwnerId>rptOwnerCik"`
RptOwnerName			string `xml:"reportingOwner>reportingOwnerId>rptOwnerName"`
RptOwnerStreet1			string `xml:"reportingOwner>reportingOwnerAddress>rptOwnerStreet1"`
RptOwnerCity			string `xml:"reportingOwner>reportingOwnerAddress>rptOwnerCity"`
RptOwnerState			string `xml:"reportingOwner>reportingOwnerAddress>rptOwnerState"`
RptOwnerZipCode			string `xml:"reportingOwner>reportingOwnerAddress>rptOwnerZipCode"`
IsDirector				string `xml:"reportingOwner>reportingOwnerRelationship>isDirector"`
IsOfficer				string `xml:"reportingOwner>reportingOwnerRelationship>isOfficer"`	
IsTenPercentOwner		string `xml:"reportingOwner>reportingOwnerRelationship>isTenPercentOwner"`
IsOther					string `xml:"reportingOwner>reportingOwnerRelationship>isOther"`		
SecurityTitleValue		string `xml:"nonDerivativeTable>nonDerivativeTransaction>securityTitle>value"`
TransactionDatevalue	string `xml:"nonDerivativeTable>nonDerivativeTransaction>transactionDate>value"`	
TransactionFormType		string `xml:"nonDerivativeTable>nonDerivativeTransaction>transactionCoding>transactionFormType"`
TransactionCode			string `xml:"nonDerivativeTable>nonDerivativeTransaction>transactionCoding>transactionCode"`
EquitySwapInvolved		string `xml:"nonDerivativeTable>nonDerivativeTransaction>transactionCoding>equitySwapInvolved"`
TransactionSharesValue					string `xml:"nonDerivativeTable>nonDerivativeTransaction>transactionAmounts>transactionShares>value"`
TransactionPricePerShareValue			string `xml:"nonDerivativeTable>nonDerivativeTransaction>transactionAmounts>transactionPricePerShare>value"`
TransactionPricePerSharefootnoteId 		string `xml:"nonDerivativeTable>nonDerivativeTransaction>transactionAmounts>transactionPricePerShare>footnoteId"`
TransactionAcquiredDisposedCodeValue	string `xml:"nonDerivativeTable>nonDerivativeTransaction>transactionAmounts>transactionAcquiredDisposedCode>value"`
SharesOwnedFollowingTransactionValue	string `xml:"nonDerivativeTable>nonDerivativeTransaction>ownershipNature>directOrIndirectOwnership>value"`
Footnote 				   				Footnotes 	`xml:"footnotes"`
OwnerSignaturesignatureName 			string       `xml:"ownerSignature>signatureName"`
OwnerSignaturesignatureDate				string       `xml:"ownerSignature>signatureDate"`
}
type Footnotes struct{
ID	 		string `xml:"id,attr"`
Footnote 	string `xml:"footnote"`
}