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RE: XML Schema usage submission

From: Bob Schloss <rschloss@us.ibm.com>
Date: Mon, 10 Jun 2002 17:51:21 -0400
To: nathan.crews@autodesk.com
Cc: cmsmcq@w3.org, xmlschema-dev@w3.org
Message-ID: <OF9DFCA527.CE6CCAA3-ON85256BD4.0077B669@us.ibm.com>
                                                                                                               
                                                                                                               
                                                                                                               


Nathan,

      Instead of saying
<xsd:sequence>
 <xsd:element name="Feature" minOccurs="0" .../>
 <xsd:any namespace="##any".../>
</xsd:sequence>
      perhaps you can say
<xsd:sequence>
 <xsd:element name="Feature" nillable="true".../>
  <xsd:any namespace="##any"../>
</xsd:sequence>
although that would require documents that do not use feature
to say
 <Feature xsi:nill="true"/>

      This would allow the use of any and your content
models would be deterministic.

            Regards,
            Bob




nathan.crews@autodesk.com on 06/10/2002 05:38:04 PM

To:    Bob Schloss/Watson/IBM@IBMUS
cc:    cmsmcq@w3.org, xmlschema-dev@w3.org
Subject:    RE: XML Schema usage submission




Thanks Bob.

I have tried the schema validator at sourceforge and used XMLSpy 4.4,
msxml4 sp1, msxml3 sp2, and System.XML in .NET. I will add the one at IBM
in the future. I can validate in all, but I do get the non-determinstic
content warnings in .NET.

Yes, the use of the <xs:any> attribute with in the <Feature> element is
intentional. This is where application specific freeform data may or may
not exist. I have tried various methods and the current one, while creating
indeterminate content, does work in practice.

Basically with in the <Feature> element we want freeform data to co-exist
along with the deterministic content. I will have another look at the <PVI>
sequencing restrictions.

Can I use the <xs:any> element anywhere and still be deterministic?

Nathan Crews
www.landxml.org

-----Original Message-----
From: Bob Schloss
To: nathan.crews@autodesk.com
Cc: cmsmcq@w3.org; xmlschema-dev@w3.org
Sent: 6/10/02 1:33 PM
Subject: Re: XML Schema usage submission

Nathan,

I believe that your schema is not valid.

I ran it through the IBM XML Schema Quality Checker
(available at http://www.alphaworks.ibm.com/tech/xmlsqc
<http://www.alphaworks.ibm.com/tech/xmlsqc> ) and it
pointed out several problems, including 5 cases where you appear
to have an ambiguous content model.

Here is an image of how it looks in my browser
with the SQC output styled by a stylesheet:


And here is the actual output from SQC:
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="file:/C:/sqc/ErrorReport.xsl"?>
<schemaAnalysis
SchemaQualityCheckerVersion="2.0.1"
anyWarningsRequestedToBeSuppressed="false" cost="10"
haltAtFirstError="false"
requireEachDocumentValid="false" schemaLanguageVersion="2001-05-02">
<file fileNameWithoutPath="LandXML-1.0.xsd" filename="LandXML-1.0.xsd">
<startdatetime>2002-06-10T16:06:30</startdatetime>
<error severity="1" type="2">
<source column="26" line="1265"
location="file:C:/sqc/LandXML-1.0.xsd"
locationWithoutPath="LandXML-1.0.xsd"/>
<message>Ambiguous content model : the following particles
overlap : &lt;xs:element block=&quot;&quot;
maxOccurs=&quot;unbounded&quot; minOccurs=&quot;0&quot;
ref=&quot;Feature&quot;/&gt; , &lt;xs:any
maxOccurs=&quot;1&quot; minOccurs=&quot;1&quot;
namespace=&quot;##any&quot;/&gt; . </message>
</error>

<error severity="1" type="2">
<source column="26" line="1358"
location="file:C:/sqc/LandXML-1.0.xsd"
locationWithoutPath="LandXML-1.0.xsd"/>
<message>Ambiguous content model : the following particles
overlap : &lt;xs:element block=&quot;&quot;
maxOccurs=&quot;1&quot; minOccurs=&quot;0&quot;
ref=&quot;Start&quot;/&gt; , &lt;xs:any
maxOccurs=&quot;1&quot; minOccurs=&quot;1&quot;
namespace=&quot;##any&quot;/&gt; . </message>
</error>

<error severity="1" type="2">
<source column="26" line="2578"
location="file:C:/sqc/LandXML-1.0.xsd"
locationWithoutPath="LandXML-1.0.xsd"/>
<message>Ambiguous content model : the following particles
overlap : &lt;xs:element block=&quot;&quot;
maxOccurs=&quot;unbounded&quot; minOccurs=&quot;0&quot;
ref=&quot;PVI&quot;/&gt; , &lt;xs:element
block=&quot;&quot; maxOccurs=&quot;1&quot;
minOccurs=&quot;1&quot; ref=&quot;PVI&quot;/&gt; . </message>
</error>

<error severity="1" type="2">
<source column="26" line="36"
location="file:C:/sqc/LandXML-1.0.xsd"
locationWithoutPath="LandXML-1.0.xsd"/>
<message>Ambiguous content model : the following particles
overlap : &lt;xs:element block=&quot;&quot;
maxOccurs=&quot;1&quot; minOccurs=&quot;1&quot;
ref=&quot;Units&quot;/&gt; , &lt;xs:any
maxOccurs=&quot;1&quot; minOccurs=&quot;1&quot;
namespace=&quot;##any&quot;/&gt; . </message>
</error>

<error severity="1" type="2">
<source column="26" line="963"
location="file:C:/sqc/LandXML-1.0.xsd"
locationWithoutPath="LandXML-1.0.xsd"/>
<message>Ambiguous content model : the following particles
overlap : &lt;xs:element maxOccurs=&quot;1&quot;
minOccurs=&quot;1&quot; name=&quot;DocFileRef&quot;
nillable=&quot;false&quot;&gt;
&lt;xs:complexType&gt;
&lt;xs:attribute name=&quot;name&quot;
use=&quot;required&quot;/&gt; &lt;xs:attribute
name=&quot;location&quot; type=&quot;xs:anyURI&quot;
use=&quot;required&quot;/&gt; &lt;xs:attribute
name=&quot;fileType&quot; type=&quot;xs:string&quot;
use=&quot;optional&quot;/&gt; &lt;xs:attribute
name=&quot;fileFormat&quot; type=&quot;xs:string&quot;
use=&quot;optional&quot;/&gt;
&lt;/xs:complexType&gt; &lt;/xs:element&gt; ,
&lt;xs:any maxOccurs=&quot;1&quot;
minOccurs=&quot;1&quot; namespace=&quot;##any&quot;/&gt;
. </message>
</error>
<enddatetime>2002-06-10T16:07:19</enddatetime>
</file>
</schemaAnalysis>

Thanks,
Bob

Extensible Technologies
IBM Watson Research Center
Yorktown Heights, NY




Sent by: xmlschema-dev-request@w3.org


To: xmlschema-dev@w3.org
cc: cmsmcq@w3.org
Subject: XML Schema usage submission




I would like to contribute an XML Schema, LandXML, to the usage section
of the W3 XML Schema page.


The LandXML schema is defined, maintained and hosted by LandXML.org, an
open organization for Land Development/Transportation Industry
organization. LandXML models the civil engineering design data used to
create new residential subdivisions and build new roads.

Schema file name   : LandXML-1.0.xsd
Schema namespace: http://www.landxml.org/schema/LandXML-1.0
<http://www.landxml.org/schema/LandXML-1.0>
Schema location     :
<http://www.landxml.org/schema/LandXML-1.0/%20LandXML-1.0.xsd>
http://www.landxml.org/schema/LandXML-1.0/ LandXML-1.0.xsd

Schema Description: LandXML is an emerging XML data standard for civil
engineering and survey data used in the Land Development and
Transportation Industries. LandXML facilitates open data exchange
between software applications, provides an electronic format for design
data project submission and provides a format suitable for long term
archival.

More Information:

LandXML has a reasonably complex content model has evolved from a simple
XDR schema, (
<http://www.landxml.org/schema/landxml-0.01/LandXML-0.01.xml>
http://www.landxml.org/schema/landxml-0.01/LandXML-0.01.xml), over the
past 3 years to use most of the features available in the latest XML
Schema recommendation. The web site for the schema is
<http://www.landxml.org> http://www.landxml.org, where you will find the
schema, documentation, sample files and sample applications. There is
also a list of world-wide participants on the
<http://www.landxml.org/org.htm> http://www.landxml.org/org.htm page.

LandXML is emerging as the XML standard for the Land Development and
Transportation Industry by US Department of Transportation, AASHTO
(American Association of State Highway Officials) and the Federal
Highway Administration. LandXML is also being used and recognized
internationally by Land Information New Zealand. LandXML also has strong
support in the software vendor community
<http://www.landxml.org/landxmlapps.htm>
http://www.landxml.org/landxmlapps.htm.

Please let me know if any other information is required.

Nathan Crews
Principal Schema Architect,  <http://www.landxml.org> www.landxml.org

Software Researcher
Civil/Survey Software Development
GIS Solutions Division
Autodesk, Inc.

 <mailto:nathan.crews@autodesk.com> nathan.crews@autodesk.com
Received on Monday, 10 June 2002 17:52:31 GMT

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