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  <xsd:element abstract="true" id="xbit_statement-statement-note-3-property-and-equipment-property-and-equipment-net-details" name="statement-statement-note-3-property-and-equipment-property-and-equipment-net-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="xbit_statement-statement-note-3-property-and-equipment-tables" name="statement-statement-note-3-property-and-equipment-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="xbit_statement-statement-note-6-common-stock-options-changes-in-common-stock-options-issued-details" name="statement-statement-note-6-common-stock-options-changes-in-common-stock-options-issued-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="xbit_statement-statement-note-6-common-stock-options-changes-in-common-stock-options-issued-detailsE2BE33B2-DE0A-454D-A761-9DEE4053302A" name="statement-statement-note-6-common-stock-options-changes-in-common-stock-options-issued-detailsE2BE33B2-DE0A-454D-A761-9DEE4053302A" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="xbit_statement-statement-note-6-common-stock-options-tables" name="statement-statement-note-6-common-stock-options-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="xbit_statement-statement-significant-accounting-policies-policies" name="statement-statement-significant-accounting-policies-policies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
</xsd:schema>
