Validate and transform XML with lxml

0_validate.py

from lxml import etree

with open('./sportobj.xsd') as f:
    schema = etree.XMLSchema(etree.parse(f))

with open('./sportobj-sample.xml') as f:
    sample = etree.parse(f)

with open('./sportobj.xsl') as f:
    transform = etree.XSLT(etree.parse(f));

print(schema.validate(sample))

result = transform(sample)
binc = etree.tostring(result, pretty_print=True, encoding='utf-8')
strc = binc.decode('utf-8')
print(strc)
# with open('./sportobj.html', 'w') as f:
#     f.write(strc)

sportobj-sample.html

<div>
  <b>Негосударственное учреждение культурно-спортивный реабилитационный комплекс Всероссийского Общества Слепых&nbsp;
        [273]
      </b>
  <br/>
  <span>Москва, улица Куусинена, 19а</span>
  <ul>
    <li>Спортивный комплекс</li>
    <li>Хозяйственное ведение</li>
  </ul>
</div>

sportobj-sample.xml

<SportObj oid="273">
    <Name>Негосударственное учреждение культурно-спортивный реабилитационный комплекс Всероссийского Общества Слепых</Name>
    <Address>Москва, улица Куусинена, 19а</Address>
    <Description>
        <Facility>Спортивный комплекс</Facility>
        <Usage>Хозяйственное ведение</Usage>
    </Description>
    <Entity_Spatial>
        <Spatial_Element>
            <Spelement_Unit Type_Unit="Точка" Su_Nmb="1">
                <Ordinate X="55.787589" Y="37.510960" Ord_Nmb="1"/>
            </Spelement_Unit>
        </Spatial_Element>
    </Entity_Spatial>
</SportObj>

sportobj.xsd

<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified" version="1.0">
    <xs:element name="SportObj" type="SportObjType"/>
    <xs:complexType name="SportObjType">
        <xs:sequence>
            <xs:element name="Name" type="xs:string"/>
            <xs:element name="Address" type="xs:string"/>
            <xs:element name="Description" type="DescriptionType"/>
            <xs:element name="Entity_Spatial" type="Entity_SpatialType"/>
        </xs:sequence>
        <xs:attribute name="oid" type="xs:int" use="required"/>
    </xs:complexType>
    <xs:complexType name="DescriptionType">
        <xs:sequence>
            <xs:element name="Facility" type="xs:string" minOccurs="0"/>
            <xs:element name="Usage" type="xs:string" minOccurs="0"/>
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="Entity_SpatialType">
        <xs:sequence>
            <xs:element name="Spatial_Element" type="Spatial_ElementType" nillable="true" maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="Spatial_ElementType">
        <xs:sequence>
            <xs:element name="Spelement_Unit" type="Spelement_UnitType" maxOccurs="unbounded"/>
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="Spelement_UnitType">
        <xs:sequence>
            <xs:element name="Ordinate" type="OrdinateType" maxOccurs="unbounded"/>
        </xs:sequence>
        <xs:attribute name="Type_Unit" type="spelementTypeUnitType"/>
        <xs:attribute name="Su_Nmb" type="xs:int"/>
    </xs:complexType>
    <xs:simpleType name="spelementTypeUnitType">
        <xs:restriction base="xs:string">
            <xs:enumeration value="Точка"/>
            <xs:enumeration value="Линия"/>
        </xs:restriction>
    </xs:simpleType>
    <xs:complexType name="OrdinateType">
        <xs:attribute name="X" type="xs:double"/>
        <xs:attribute name="Y" type="xs:double"/>
        <xs:attribute name="Ord_Nmb" type="xs:int"/>
    </xs:complexType>
</xs:schema>

sportobj.xsl

<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" omit-xml-declaration="yes" media-type="text/html"/>
  <xsl:template match="SportObj">
    <div>
      <b>
        <xsl:value-of select="Name"/>
        <xsl:text disable-output-escaping="yes"><![CDATA[&nbsp;]]></xsl:text>
        [<xsl:value-of select="./@oid"/>]
      </b>
      <br/>
      <span><xsl:value-of select="Address"/></span>
      <ul>
        <xsl:for-each select="Description/*">
          <li><xsl:value-of select="text()"/></li>
        </xsl:for-each>
      </ul>
    </div>
  </xsl:template>
</xsl:stylesheet>