XML based on XSD

<?xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.gp.com/Patient"
	xmlns:tns="http://www.gp.com/Patient" elementFormDefault="qualified">

	<element name="patient" type="tns:Patient" />

	<complexType name="Patient">

		<sequence>
			<element name="id" type="tns:ID" />
			<element name="name" type="tns:string15chars" />
			<element name="age" type="int" />
			<element name="dob" type="date" />
			<element name="email" type="string" />
			<element name="gender" type="tns:genderEnum" />
			<element name="phone" type="string" />

		</sequence>

	</complexType>

	<simpleType name="ID">
		<restriction base="int">
			<pattern value="[0-9]*"></pattern>
		</restriction>
	</simpleType>

	<simpleType name="string15chars">
		<restriction base="string">
			<pattern value="15"></pattern>
		</restriction>
	</simpleType>



	<simpleType name="genderEnum">
		<restriction base="string">
			<enumeration value="M"/>
			<enumeration value="F"/>
		</restriction>
	</simpleType>


</schema>

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Based on aboveXSD i generated below XML which gives error at line 4 of XML as
Multiple annotations found at this line:
      - cvc-type.3.1.3: The value 'Maaa' of element 'tns:name' is not valid.
      - cvc-pattern-valid: Value 'Maaa' is not facet-valid with respect to pattern '15' for type
       'string15chars'.

<?xml version="1.0" encoding="UTF-8"?>
<tns:patient xmlns:tns="http://www.gp.com/Patient" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.gp.com/Patient Patient.xsd ">
  <tns:id>1</tns:id>
  <tns:name>Maaa</tns:name>
  <tns:age>0</tns:age>
  <tns:dob>2001-01-01</tns:dob>
  <tns:email>tns:email</tns:email>
  <tns:gender>M</tns:gender>
  <tns:phone>tns:phone</tns:phone>
</tns:patient>

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why i am getitng this error and how to fix it. i using eclipse for this as IDE.
any other open source XML IDEs bettr than eclipse to work on these simple xml, XSDs etc
please advise