avoid NullPointerException (value = null) while duplicating to java.util.Properties
<?xml version="1.0" encoding="UTF-8"?>
<!--
SQL-DK
Copyright © 2013 František Kučera (frantovo.cz)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
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This program is distributed in the hope that it will be useful,
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-->
<xs:schema
xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified"
targetNamespace="https://sql-dk.globalcode.info/xmlns/configuration"
xmlns:c="https://sql-dk.globalcode.info/xmlns/configuration">
<xs:element name="configuration">
<xs:complexType>
<xs:sequence>
<xs:element minOccurs="0" maxOccurs="unbounded" ref="c:database"/>
<xs:element minOccurs="0" ref="c:defaultFormatter"/>
<xs:element minOccurs="0" maxOccurs="unbounded" ref="c:formatter"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="database">
<xs:complexType>
<xs:sequence>
<xs:element ref="c:name"/>
<xs:element ref="c:url"/>
<xs:element minOccurs="0" ref="c:userName"/>
<xs:element minOccurs="0" ref="c:password"/>
<xs:element minOccurs="0" maxOccurs="unbounded" ref="c:property"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="name" type="xs:string"/>
<xs:element name="url" type="xs:string"/>
<xs:element name="userName" type="xs:string"/>
<xs:element name="password" type="xs:string"/>
<xs:element name="property">
<xs:complexType mixed="true">
<xs:attribute name="name" use="required"/>
</xs:complexType>
</xs:element>
<xs:element name="defaultFormatter" type="xs:string"/>
<xs:element name="formatter">
<xs:complexType>
<xs:sequence>
<xs:element ref="c:name"/>
<xs:element ref="c:class"/>
<xs:element minOccurs="0" maxOccurs="unbounded" ref="c:property"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="class" type="xs:string"/>
</xs:schema>