xml - Invoking libxml2 for XSD validation -

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i using libxml2 c validate following xml document:

<?xml version="1.0"?> <charms ver="0.02">   <header seqn="1184" type="bandwidth"/>   <bandwidth band="2.130000" latency="12.234000" jitter="123.456078"/>   <trailer method="md5" digest="838da77ca83abd70a13a18b82afb4820"/> </charms>

and xsd file contains:

<?xml version="1.0" encoding="utf-8"?> <xs:schema xmlns:xs="http://www.w3.org/2001/xmlschema">       <xs:element name="charms">           <xs:complextype>              <xs:sequence>                 <xs:element name="header">                     <xs:complextype>                             <xs:attribute name="seqn" type="xs:int"/>                             <xs:attribute name="type" use="required" type="xs:string"/>                     </xs:complextype>                 </xs:element>              <xs:choice>                  <xs:sequence>                     <xs:element name="bandwidth">                         <xs:complextype>                                                         <xs:attribute name="latency" type="lat_unit"/>                             <xs:attribute name="jitter" type="jit_unit"/>                             <xs:attribute name="band" type="bps"/>                         </xs:complextype>                     </xs:element>                 </xs:sequence>             </xs:choice>                  <xs:element name="trailer">                     <xs:complextype>                             <xs:attribute name="method" use="required" type="xs:string"/>                             <xs:attribute name="digest" use="required" type="xs:string"/>                     </xs:complextype>                 </xs:element>               </xs:sequence>             <xs:attribute name="ver" use="required" type="xs:decimal"/>         </xs:complextype>     </xs:element>         <xs:simpletype name="lat_unit">       <xs:restriction base="xs:decimal"/>     </xs:simpletype>     <xs:simpletype name="jit_unit">       <xs:restriction base="xs:decimal"/>     </xs:simpletype>     <xs:simpletype name="bps">       <xs:restriction base="xs:decimal"/>     </xs:simpletype>      <xs:simpletype name="address">       <xs:restriction base="xs:string">         <xs:pattern value="((1?[0-9]?[0-9]|2[0-4][0-9]|25[0-5]).){3}(1?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])"/>       </xs:restriction>     </xs:simpletype> </xs:schema>

but when try validate it, validation works receive following error message:

test.xml:2: element charms: schemas validity error : element 'charms': no matching global declaration available validation root.

what's meaning of error message ?


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