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The value space is the infinite set of integers greater than or equal to 1.
The lexical space is a finite-length sequence of decimal digits with an optional leading +.
<!-- schema -->
<xsd:complexType name="record_sets">
<xsd:sequence>
<xsd:element name="record" minOccurs="0"
maxOccurs="unbounded">
<xsd:simpleType>
<xsd:restriction base="xsd:positiveInteger">
<xsd:pattern value="555\d{3}"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
<!-- instance document -->
<record>555158</record>
<record>555687</record>
<record>555736</record>
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