Dear Timothy,

Ok, I created a full working sample starting from your schema fragment. Basically we define a "scopes" element that can contain more "scope" elements. A "scope" element has mixed content and can contain "important" elements.

All the sample files are available also in an archive here
http://www.oxygenxml.com/update/xincludeWithSchema.zip

The sample covers both cases, the schema allows also the xi:include element (in the case when XInclude processing is disabled and this is needed also for content completion) and the content that replaces the xi:include (the additional xml:base attribute that appears on the included elements).

test.xsd:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
  xmlns:xi="http://www.w3.org/2001/XInclude";>
  <xs:import namespace="http://www.w3.org/2001/XInclude";
    schemaLocation="xinclude.xsd"/>
  <xs:import namespace="http://www.w3.org/XML/1998/namespace";
    schemaLocation="xml.xsd"/>
  <xs:element name="scopes">
    <xs:complexType>
      <xs:sequence maxOccurs="unbounded">
        <xs:choice>
          <xs:element ref="xi:include" minOccurs="0"/>
          <xs:element ref="scope"/>
        </xs:choice>
      </xs:sequence>
    </xs:complexType>
  </xs:element>

  <xs:element name="scope">
    <xs:complexType>
      <xs:complexContent>
        <xs:extension base="scopeType">
          <xs:attributeGroup ref="xml:specialAttrs"/>
        </xs:extension>
      </xs:complexContent>
    </xs:complexType>
  </xs:element>

  <xs:complexType name="scopeType" mixed="true">
    <xs:choice minOccurs="0">
      <xs:element name="important" type="xs:string"/>
    </xs:choice>
    <xs:attribute name="name" type="xs:string" use="required"/>
  </xs:complexType>
</xs:schema>

A sample XML looks like below:

test.xml
<?xml version="1.0" encoding="UTF-8"?>
<scopes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
  xsi:noNamespaceSchemaLocation="test.xsd">
  <scope name="test"/>
  <include xmlns="http://www.w3.org/2001/XInclude"; href="included.xml"/>
  <scope name="another scope"/>
</scopes>

included.xml
<?xml version="1.0" encoding="UTF-8"?>
<scope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
  xsi:noNamespaceSchemaLocation="test.xsd"
  name="inlcudedScope">
  This is an <important>included</important> scope.
</scope>

The other schemas are:

xml.xsd
<?xml version='1.0'?>
<xs:schema targetNamespace="http://www.w3.org/XML/1998/namespace"; xmlns:xs="http://www.w3.org/2001/XMLSchema"; xml:lang="en">

 <xs:annotation>
  <xs:documentation>
   See http://www.w3.org/XML/1998/namespace.html and
   http://www.w3.org/TR/REC-xml for information about this namespace.

    This schema document describes the XML namespace, in a form
    suitable for import by other schema documents.

    Note that local names in this namespace are intended to be defined
    only by the World Wide Web Consortium or its subgroups.  The
    following names are currently defined in this namespace and should
    not be used with conflicting semantics by any Working Group,
    specification, or document instance:

    base (as an attribute name): denotes an attribute whose value
         provides a URI to be used as the base for interpreting any
         relative URIs in the scope of the element on which it
         appears; its value is inherited.  This name is reserved
         by virtue of its definition in the XML Base specification.

    id   (as an attribute name): denotes an attribute whose value
         should be interpreted as if declared to be of type ID.
         The xml:id specification is not yet a W3C Recommendation,
         but this attribute is included here to facilitate experimentation
         with the mechanisms it proposes.  Note that it is _not_ included
         in the specialAttrs attribute group.

    lang (as an attribute name): denotes an attribute whose value
         is a language code for the natural language of the content of
         any element; its value is inherited.  This name is reserved
         by virtue of its definition in the XML specification.

    space (as an attribute name): denotes an attribute whose
         value is a keyword indicating what whitespace processing
         discipline is intended for the content of the element; its
         value is inherited.  This name is reserved by virtue of its
         definition in the XML specification.

    Father (in any context at all): denotes Jon Bosak, the chair of
         the original XML Working Group.  This name is reserved by
         the following decision of the W3C XML Plenary and
         XML Coordination groups:

             In appreciation for his vision, leadership and dedication
             the W3C XML Plenary on this 10th day of February, 2000
             reserves for Jon Bosak in perpetuity the XML name
             xml:Father
  </xs:documentation>
 </xs:annotation>

 <xs:annotation>
  <xs:documentation>This schema defines attributes and an attribute group
        suitable for use by
        schemas wishing to allow xml:base, xml:lang or xml:space attributes
        on elements they define.

        To enable this, such a schema must import this schema
        for the XML namespace, e.g. as follows:
        &lt;schema . . .>
         . . .
         &lt;import namespace="http://www.w3.org/XML/1998/namespace";
                    schemaLocation="http://www.w3.org/2001/03/xml.xsd"/>

        Subsequently, qualified reference to any of the attributes
        or the group defined below will have the desired effect, e.g.

        &lt;type . . .>
         . . .
         &lt;attributeGroup ref="xml:specialAttrs"/>

         will define a type which will schema-validate an instance
         element with any of those attributes</xs:documentation>
 </xs:annotation>

 <xs:annotation>
  <xs:documentation>In keeping with the XML Schema WG's standard versioning
   policy, this schema document will persist at
   http://www.w3.org/2005/08/xml.xsd.
   At the date of issue it can also be found at
   http://www.w3.org/2001/xml.xsd.
   The schema document at that URI may however change in the future,
   in order to remain compatible with the latest version of XML Schema
   itself, or with the XML namespace itself.  In other words, if the XML
   Schema or XML namespaces change, the version of this document at
   http://www.w3.org/2001/xml.xsd will change
   accordingly; the version at
   http://www.w3.org/2005/08/xml.xsd will not change.
  </xs:documentation>
 </xs:annotation>

 <xs:attribute name="lang">
  <xs:annotation>
<xs:documentation>This attribute MAY be inserted in documents to specify the language used in the contents and attribute values of any element in an XML document. The values are the ISO 2- and 3-letter codes. An empty string value means the 'un-declaration' of xml:lang. See RFC 3066 at
    http://www.ietf.org/rfc/rfc3066.txt and the IANA registry at
http://www.iana.org/assignments/lang-tag-apps.htm for further information.</xs:documentation>
  </xs:annotation>
  <xs:simpleType>
   <xs:union memberTypes="xs:language">
    <xs:simpleType>
     <xs:restriction base="xs:string">
      <xs:enumeration value=""/>
     </xs:restriction>
    </xs:simpleType>
   </xs:union>
  </xs:simpleType>
 </xs:attribute>

 <xs:attribute name="space">
  <xs:annotation>
<xs:documentation>This attribute is attached to an element to signal an intention that in that element, white space should be preserved by applications. Possible values are "default" and
    "preserve". </xs:documentation>
  </xs:annotation>
  <xs:simpleType>
   <xs:restriction base="xs:NCName">
    <xs:enumeration value="default">
     <xs:annotation>
<xs:documentation>Specifies that the whitespaces should not be preserved.</xs:documentation>
     </xs:annotation>
    </xs:enumeration>
    <xs:enumeration value="preserve">
     <xs:annotation>
<xs:documentation>Specifies that the whitespaces should be preserved.</xs:documentation>
     </xs:annotation>
    </xs:enumeration>
   </xs:restriction>
  </xs:simpleType>
 </xs:attribute>

 <xs:attribute name="base" type="xs:anyURI">
  <xs:annotation>
<xs:documentation>The attribute xml:base may be inserted in XML documents to specify a base URI other than the base URI of the document or external entity. See http://www.w3.org/TR/xmlbase/
    for information about this attribute.</xs:documentation>
  </xs:annotation>
 </xs:attribute>

 <xs:attribute name="id" type="xs:ID">
  <xs:annotation>
<xs:documentation>Defines an ID value without the need of a DTD or schmea. See http://www.w3.org/TR/xml-id/ for information about this attribute.</xs:documentation>
  </xs:annotation>
 </xs:attribute>

 <xs:attributeGroup name="specialAttrs">
  <xs:attribute ref="xml:base"/>
  <xs:attribute ref="xml:lang"/>
  <xs:attribute ref="xml:space"/>
 </xs:attributeGroup>

</xs:schema>

xinclude.xsd
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
  targetNamespace="http://www.w3.org/2001/XInclude";
  xmlns:xi="http://www.w3.org/2001/XInclude";
  finalDefault="extension">

  <xs:annotation>

    <xs:documentation> Not normative, but may be useful. See the REC
      http://www.w3.org/TR/XInclude for definitive information about
      this namespace. </xs:documentation>
  </xs:annotation>
  <xs:element name="include" type="xi:includeType"/>

  <xs:complexType name="includeType" mixed="true">

    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:element ref="xi:fallback"/>
      <xs:any namespace="##other" processContents="lax"/>
      <xs:any namespace="##local" processContents="lax"/>
    </xs:choice>
    <xs:attribute name="href" use="optional" type="xs:anyURI"/>
    <xs:attribute name="parse" use="optional" default="xml"
      type="xi:parseType"/>
    <xs:attribute name="xpointer" use="optional" type="xs:string"/>
    <xs:attribute name="encoding" use="optional" type="xs:string"/>
    <xs:attribute name="accept" use="optional" type="xs:string"/>
    <xs:attribute name="accept-language" use="optional" type="xs:string"/>
    <xs:anyAttribute namespace="##other" processContents="lax"/>
  </xs:complexType>

  <xs:simpleType name="parseType">

    <xs:restriction base="xs:token">
      <xs:enumeration value="xml"/>
      <xs:enumeration value="text"/>
    </xs:restriction>
  </xs:simpleType>
  <xs:element name="fallback" type="xi:fallbackType"/>

  <xs:complexType name="fallbackType" mixed="true">

    <xs:choice minOccurs="0" maxOccurs="unbounded">
      <xs:element ref="xi:include"/>
      <xs:any namespace="##other" processContents="lax"/>
      <xs:any namespace="##local" processContents="lax"/>
    </xs:choice>
    <xs:anyAttribute namespace="##other" processContents="lax"/>
  </xs:complexType>
</xs:schema>

Best Regards,
George
---------------------------------------------------------------------
George Cristian Bina - http://aboutxml.blogspot.com/
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
http://www.oxygenxml.com


Timothy Reaves wrote:
On Tue, July 17, 2007 16:13, George Cristian Bina wrote:
Dear Timothy,


oXygen has an option "Enable XInclude processing" that I believe is
enabled by default. When that is enables the validation against XML Schema
is performed after XInclude processing, that means the XML Schema should
not care about defining the xi:include element but it should take into
account that the included fragment will have an xml:base attribute
pointing to the location it was included from and probably also an
xml:lang. So for
instance if you want to have scope elements inside scopes and you plan to
include scope elements from other documents using XInclude then you should
define xml:base (and xml:lang) to be allowed in the scope element.

When the XInclude processing is not enabled then oXygen will validate
the document as it is against the specified XML Schema. In that case you
need to refer to the xi:include element inside the schema, as in your
sample. The problem in your case is the wrong namespace that you used in
import, the correct nemespace is http://www.w3.org/2001/XInclude, that is
not with 2003.

Best Regards,
George

     Do you have a sample document that shows this working correctly?


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