LECIS — XML Schema update

The SCD XML Schema does not meet the current version of the w3c schema defintion.
XML-Spy updated the schema definition automatically. It did not change the "LECIS content", only the min/maxOccurs where updated.
Here are the differences from a "diff" output:

3c3
< <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
—
> <xsd:schema xmlns:xsd="http://www.w3.org/2000/10/XMLSchema">
7c7
< <xsd:element name="SYSTEM" type="SYSTEM_TYPE"/>
—
> <xsd:element name="SYSTEM" type="SYSTEM_TYPE" maxOccurs="1"/>
161c161
< <xsd:element name="SUPERCELL" type="xsd:IDREF" minOccurs="0"/>
—
> <xsd:element name="SUPERCELL" type="xsd:IDREF" minOccurs="0" maxOccurs="1"/>
293,295c293,295
< <xsd:element name="XTRANSLATION" type="xsd:long"/>
< <xsd:element name="YTRANSLATION" type="xsd:long"/>
< <xsd:element name="ZTRANSLATION" type="xsd:long"/>
—
> <xsd:element name="XTRANSLATION" type="xsd:long" maxOccurs="1" minOccurs="1"/>
> <xsd:element name="YTRANSLATION" type="xsd:long" maxOccurs="1" minOccurs="1"/>
> <xsd:element name="ZTRANSLATION" type="xsd:long" maxOccurs="1" minOccurs="1"/>
300,302c300,302
< <xsd:element name="XROTATION" type="xsd:long"/>
< <xsd:element name="YROTATION" type="xsd:long"/>
< <xsd:element name="ZROTATION" type="xsd:long"/>
—
> <xsd:element name="XROTATION" type="xsd:long" minOccurs="1" maxOccurs="1"/>
> <xsd:element name="YROTATION" type="xsd:long" maxOccurs="1" minOccurs="1"/>
> <xsd:element name="ZROTATION" type="xsd:long" maxOccurs="1" minOccurs="1"/>
330c330,331
< <xsd:element name="SYSTEM_VARIABLES" type="SYSTEM_VARIABLE_TYPE" minOccurs="0" maxOccurs="0"/>
—
> <xsd:element name="SYSTEM_VARIABLES" type="SYSTEM_VARIABLE_TYPE" minOccurs="0" maxOccurs="
> unbounded"/>
346c347,348
< <xsd:element name="SYSTEM_VARIABLES" type="SYSTEM_VARIABLE_TYPE" minOccurs="0" maxOccurs="0"/>
—
> <xsd:element name="SYSTEM_VARIABLES" type="SYSTEM_VARIABLE_TYPE" minOccurs="0" maxOccurs="
> unbounded"/>
364c366,367
< <xsd:element name="MACRO_COMMANDS" type="EXT_MACRO_COMMAND_TYPE" minOccurs="0" maxOccurs="0"/>
—
> <xsd:element name="MACRO_COMMANDS" type="EXT_MACRO_COMMAND_TYPE" minOccurs="0" maxOccurs="
> unbounded"/>

Schema amended to comply with W3C schema