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XSD: The attribute type is missing

I am trying to use XSD on a XSD schema generated by trang. It is giving me the following error:
>xsd examcard.xsd /nologo /classes
Schema validation warning: The 'http://www.w3.org/2001/XMLSchema-instance:type' attribute is not declared. Line 33, position 12.
[...]
Warning: Schema could not be validated. Class generation may fail or may produce incorrect results.
Error: Error generating classes for schema 'examcard'.
- The attribute type is missing.
If you would like more help, please type "xsd /?".
What does this error means ? How should I include the type type for XSD to work ?
For reference examcard.xsd is:
<?xml version="1.0" encoding="UTF-8"?>
[...]
<xs:import namespace="http://www.w3.org/2001/XMLSchema-instance" schemaLocation="xsi.xsd"/>
where xsi.xsd is:
<?xml version="1.0" encoding="UTF-8"?>
[...]
<xs:attribute name="type" type="xs:NMTOKEN"/>
And current version is:
>xsd /?
Microsoft (R) Xml Schemas/DataTypes support utility
[Microsoft (R) .NET Framework, Version 4.8.3928.0]
Full code at:
https://github.com/malaterre/ExamCard/blob/master/xsd/examcard.xsd

How to reference XSD schema correctly? [duplicate]

I found some tips for this problem, but still didn't help me.
Here is my XML
<?xml version="1.0" encoding="UTF-8"?>
<work xmlns="http://www.w3.org/2001/XMLSchema"
xmlns:tns="http://www.w3.org/2001/XMLSchema-instance"
tns:schemaLocation="myXSDSchema.xsd">
<tns:Objects>
<tns:Object Name=":" Location=":">
</tns:Object>
</tns:Objects>
</work>
Here is my XSD file:
<schema xmlns="http://www.w3.org/2001/XMLSchema"
xmlns:tns = "http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified">
(some checks)
</schema>
My XSD file is located in the same folder as the XML.
How to link these 2 files?

How to link an XSD to an XML document depends upon whether the XML document is using namespaces or not...
Without namespaces
Use xsi:noNamespaceSchemaLocation to provide a hint as to the XSD to be used:
XML
<root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="example.xsd">
<!-- ... -->
</root>
XSD
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="root">
<!-- ... -->
</xsd:element>
</xsd:schema>
With namespaces
Use xsi:schemaLocation to provide a hint as to the XSD to be used:
XML
<ns:root xmlns:ns="http://example.com/ns"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://example.com/ns example-ns.xsd">
<!-- ... -->
</ns:root>
XSD
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://example.com/ns">
<xsd:element name="root">
<!-- ... -->
</xsd:element>
</xsd:schema>

Failed to generate code. Exception of type 'System.Data.Design.InternalException' was thrown, however using web.config for connection

I have create a web app, but when I push it live using IIS, I get the following error
Failed to generate code. Exception of type 'System.Data.Design.InternalException' was thrown.
Line 1:
<?xml version="1.0" encoding="utf-8"?>
Line 2:
<xs:schema id="test" targetNamespace="test.xsd" xmlns:mstns="http://tempuri.org/test.xsd" xmlns="http://tempuri.org/test.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:msprop="urn:schemas-microsoft-com:xml-msprop" attributeFormDefault="qualified" elementFormDefault="qualified">
Line 3: <xs:annotation>
I have read online that it is the connection, however when I created the dataset, I used my web.config connection string as the reference point.
However when I check the XSD it is pointing to my web.config.

Problems with OpenXML 2.5 XSL Transformation Word 2013 C#

Can anyone help me out on this problem?
I haven't done anything with OpenXML before and it has me stumped!
I have a Word Document which is an invoice.
In this document, I have the usual headers etc, plus the 'fields' which need to be populated with data from my XML dataset from SQLServer.
I took a copy of the word/document.xml from the docx and made the recommended changes to the file to convert it into an XSLT file.
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
becomes
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:n2="urn:hl7-org:v3"
exclude-result-prefixes="n2 xs xsi xsl">
<xsl:output method="xml" encoding="UTF-8" indent="yes"/>
<xsl:template match="/">
and the file is terminated with
</xsl:template>
</xsl:stylesheet>
Then, I changed some of my 'fields' to show where I wanted the data to be merged.
All well and good......
When I ran it, I got a new file which looked OK but would not open in Word 2013. I pulled the document.xml out of the docx and tried to open that. This gave me an Unspecified Error Line 1 Column 1257.
I have since tried all sorts of things, including creating an XSLT with no merge fields, just the headers and footers set up, and I get the same thing.
I have tried several different headers with differing complexity and always get the same error.
When I trace the error, it is in this tag line
<w:document xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" xmlns:wpc="http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:wp14="http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing" xmlns:wp="http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing" xmlns:w10="urn:schemas-microsoft-com:office:word" xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main" xmlns:w14="http://schemas.microsoft.com/office/word/2010/wordml" xmlns:w15="http://schemas.microsoft.com/office/word/2012/wordml" xmlns:wpg="http://schemas.microsoft.com/office/word/2010/wordprocessingGroup" xmlns:wpi="http://schemas.microsoft.com/office/word/2010/wordprocessingInk" xmlns:wne="http://schemas.microsoft.com/office/word/2006/wordml" xmlns:wps="http://schemas.microsoft.com/office/word/2010/wordprocessingShape" mc:Ignorable="w14 w15 wp14">
which finishes with column 1257:
mc:Ignorable="w14 w15 wp14">
I have checked that the namespaces are all declared but I cannot see, or understand, what is going wrong
Any ideas?
Thanks

Loading multiple XDocuments, and working with its documents

I wrote several lines of code but still can't get over this:
I need to load many xml docs from web library. I don't know how many documents there are so I wonder which loop should I use while loading:
XDocument doc = XDocument.Load("http://" + i);
where -i is identifiers number.
I tried loading until i get document without meaningful content (thought it is the end, the rest are empty), but problem is that there is several Xdocs that are empty in the middle of library.
XML with content looks like
<?xml version="1.0" encoding="utf-8"?>
<OP xmlns="" xmlns:xsi="" xsi:schemaLocation="">
<request verb="GR" identifier="53" metadataPrefix="p"></request>
<GR>
<header>
<identifier>53,number of doc...used for counting</identifier>
</header>
<metadata>
<P xmlns="" xsi:schemaLocation="">
<TITLE>title</TITLE>
<CERTIFICATE NAME="different names">
</CERTIFICATE>
<YEAR>
<DATE>2012-10-18T00:00:00Z</DATE>
</YEAR>
<MINIATURE>
<COPY>
<CNAME>Copy name<CNAME>
<FORMAT>obj/max/dxf/3ds/...</FORMAT>
</COPY>
</MINIATURE>
</metadata>
</GR>
</OP>
XML without content
<?xml version="1.0" encoding="utf-8"?>
<OP xmlns="" xmlns:xsi="" xsi:schemaLocation="">
<request verb="GR" identifier="53" metadataPrefix="p"></request>
Furthermore, I need to do some counting like:
Tot.no. of doc,
No. of docs per certificate <CERTIFICATE>
No. of docs for each year <YEAR><DATE>
No of docs for each format <MINIATURE><COPY><FORMAT>
and my output should look like:
<?xml version="1.0" encoding="UTF-8" ?>
<Statistic>
<DocSum>21220</DocSum>
<Certificates>
<Certificate id=”certificateName”>17098</Certificate>
…
<Certificates>
<Years>
<Year year=”2014”>23</Year>
…
</Years>
<Miniature>
<Format post=”obj”>11723</Format>
…
</Miniature>
</Statistic>
If you could give me some help, hints or tips how to deal with it.

The posted answer by smink to the following thread should get you on the right path.
C# HttpWebRequest command to get directory listing
One of the easiest ways to get a list of the files of a web directory without knowing exactly how many there are or their filenames is by parsing the html of the directory and pulling out the tags.
You can then iterate through these tags and filter them out for the files by extensions that you need. I can provide a more in-depth example if necessary.