Hoss,
There were a few comments about schema files in Mark Mail between you
and Grant a couple of months ago, no big demand for them for the
schema.xml file. Before I drop this would you consider taking a look at
XSD file below for the schema.xml and perhaps submit the XSD file the
SVN system? I can send it to you in a zip file, so it is formatted
nicer.
Thanks,
Peter
-----Original Message-----
From: Lenahan, Peter
Sent: Saturday, November 15, 2008 10:08 PM
To: solr-user@lucene.apache.org
Subject: :TODO: we should try to make a DTD for the schema, DONE as XSD
instead
From: Peter Lenahan
I noticed on the solr wiki the comment
" :TODO: we should try to make a DTD for the schema "
Well that wasn't very hard, and an XSD file is much better to work with
than a DTD so I created an XSD file. But I have a few questions about
the test results of applying an XSD schema to the various schema.xml
files I downloaded. Actually running the test was more work than writing
the schema.xsd file.
The schema.xsd file is at the bottom of this posting.
They tests were not all clean.
First off to use the schema.xsd file, you need to place the schema.xsd
file in the directory that contains the schema.xml file. Then you change
the <schema element in the schema.xml files to reference the xsd file as
follows.
<schema name="Solr schema.xml file" version="1.1"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:noNamespaceSchemaLocation="schema.xsd">
This schema declaration tags the elements in the default namespace.
It would be better if all the elements were in an assigned namespace.
But it would require changing all the elements in the files to test it.
Here are the test results of applying the XSD schema to all the
schema.xml files available in the solr download.
I have a few questions about the test results.
In some schema.xml files the order of elements are reversed, I allowed
this but I was not sure if it was intentional. The elements are
"defaultSearchField", "uniqueKey"
I allow these to be reversed, should they be in either order like this?
I am also not a committer so would someone like to step up and add the
xsd file to the source control system?
Thanks,
Peter
Test Summary:
I ran the tests by hand on each of the files, I didn't create a test
script.
First there were 12 passing files.
There were a couple of files that contained attributes that the
documentation was not complete for.
Then there were 3 failures. I think that these are errors in the
schema.xml files.
========================================================================
====
1 - PASSED
src\test\test-files\solr\conf
Validating schema-not-required-unique-key.xml...
The XML document schema-not-required-unique-key.xml is valid
========================================================================
====
2 - PASSED
apache-solr-1.3.0\contrib\dataimporthandler\src\test\resources\solr\conf
Validating dataimport-schema.xml...
The XML document dataimport-schema.xml is valid
========================================================================
===
3 - PASSED
apache-solr-1.3.0\client\ruby\solr-ruby\solr\test\
Validating schema.xml...
The XML document schema.xml is valid
========================================================================
====
4 - PASSED
Validating
apache-solr-1.3.0\example\example-DIH\solr\db\conf\schema.xml...
The XML document schema.xml is valid
========================================================================
====
5 - PASSED
Validating apache-solr-1.3.0\example\multicore\core0\conf\schema.xml...
The XML document schema.xml is valid
========================================================================
====6 - PASSED
Validating apache-solr-1.3.0\example\multicore\core1\conf\schema.xml...
The XML document schema.xml is valid
========================================================================
====
7 - PASSED
Validating apache-solr-1.3.0\example\solr\conf\schema.xml...
The XML document schema.xml is valid
========================================================================
====
8 - PASSED
apache-solr-1.3.0\src\test\test-files\solr\conf
Validating bad-schema.xml...
file:///c:/transform/tests/bad-schema.xml:44,11: Element 'fieldType' is
not valid
for content model: '(field,dynamicField)'
The XML document bad-schema.xml is NOT valid (1 errors)
I think that this is the correct result. Because the fieldType occurs in
the middle
of the fields declaration.
========================================================================
====
9 - PASSED
apache-solr-1.3.0\src\test\test-files\solr
Validating crazy-path-to-schema.xml...
The XML document crazy-path-to-schema.xml is valid
========================================================================
====
10 - PASSED
apache-solr-1.3.0\client\ruby\solr-ruby\solr\conf\
Validating schema.xml...
The XML document schema.xml is valid
========================================================================
====
11 - PASSED
apache-solr-1.3.0\src\test\test-files\solr\shared\conf
Validating schema.xml...
The XML document schema.xml is valid
========================================================================
====
12 - PASSED, Initially FAILED but Now PASSING
When I validated this schema.xml file there were three errors.
These attributes don't seem to be documented elsewhere, and I did't find
the doc
for this class ExternalFileField.
I found some stuff on sourceforge that I didn't follow thru on it.
I have added these attributes to the schema.xsd file,
If this is correct this should be documented somewhere.
If this is incorrect, then the attributes should be removed from the
schema.
apache-solr-1.3.0\src\test\test-files\solr\conf
Validating schema11.xml...
schema11.xml:237,132: Attribute 'keyField' is not declared for element
'fieldType'
schema11.xml:237,132: Attribute 'defVal' is not declared for element
'fieldType'
schema11.xml:237,132: Attribute 'valType' is not declared for element
'fieldType'
Line:237: <fieldType name="file" keyField="id" defVal="1" stored="false"
indexed="false" class="solr.ExternalFileField" valType="float"/>
The XML document schema11.xml is NOT valid (3 errors)
--------------------
After adding the attributes missing from the Wiki.
Finally PASSING
apache-solr-1.3.0\src\test\test-files\solr\conf
Validating schema11.xml...
The XML document schema11.xml is valid
========================================================================
====
13 - FAILED(1) - Question about attributes?
apache-solr-1.3.0\src\test\test-files\solr\conf
Validating schema-required-fields.xml...
I was not sure about this?
I didn't want to add these missing attributes to the schema unless this
is correct.
They don't seem to be in the documentation.
Can anyone tell me if they should be there?
Is there a 'name' attribute on the filter element?
Is there a 'sortMissingFirst' on the field element?
Also there are a couple of cases where the analyzer doesn't have a
tokenizer and
filter. I assume that is correct, so I changed the definition of the
analyzer
description from what I saw in the documentation to allow no tokenizer
and a class
name attribute on the analyzer tag. I imagine that this format should be
documented
on the wiki as well. I didn't do it because I wasn't sure.
file:///c:/transform/tests/schema-required-fields.xml:116,72: Attribute
'class' is
not declared for element 'analyzer'
file:///c:/transform/tests/schema-required-fields.xml:116,72: Element
'analyzer' is
not valid for content model: '(tokenizer,filter)'
file:///c:/transform/tests/schema-required-fields.xml:270,89: Attribute
'name' is
not declared for element 'filter'
file:///c:/transform/tests/schema-required-fields.xml:365,96: Attribute
'sortMissingFirst' is not declared for element 'field'
The XML document schema-required-fields.xml is NOT valid (4 errors)
The first 2 errors can be resolved easily if this is the correct syntax.
My initial definition of the analyzer element was a required tokenizer
and an
optional filter.
<xs:element name="analyzer">
<xs:complexType>
<xs:sequence>
<xs:element ref="tokenizer"/>
<xs:element minOccurs="0"
maxOccurs="unbounded"
ref="filter"/>
</xs:sequence>
<xs:attribute name="id" type="xs:ID"/>
<xs:attribute name="type" type="xs:NCName"/>
</xs:complexType>
</xs:element>
To allow no tokenizer and allow the class attribute on the analyzer
element I
changed the schema to allow it as follows.
<xs:element name="analyzer">
<xs:complexType>
<xs:sequence>
<xs:element minOccurs="0"
ref="tokenizer"/>
<xs:element minOccurs="0"
maxOccurs="unbounded"
ref="filter"/>
</xs:sequence>
<xs:attribute name="id" type="xs:ID"/>
<xs:attribute name="type" type="xs:NCName"/>
<xs:attribute name="class" type="xs:string"/>
</xs:complexType>
</xs:element>
My question really is, Is this correct?
Now my test results look as follows.
Validating schema-required-fields.xml...
file:///c:/transform/tests/schema-required-fields.xml:270,89: Attribute
'name' is
not declared for element 'filter'
file:///c:/transform/tests/schema-required-fields.xml:365,96: Attribute
'sortMissingFirst' is not declared for element 'field'
The XML document schema-required-fields.xml is NOT valid (2 errors)
========================================================================
====
14 - FAILED(2) - Error in the schema file
copyField is defined incorrectly in this schema.
Validating apache-solr-1.3.0exampleexample-DIHsolrrssconfschema.xml...
/apache-solr-1.3.0/example/example-DIH/solr/rss/conf/schema.xml:303,11:
Element 'copyField' is not valid for content model:
'(field,dynamicField)'
The XML document schema.xml is NOT valid (1 errors)
========================================================================
====
15 - FAILED(3)
2 problems in this file
FAILED not sure if I should add these attributes to the elements filter
and field.
DOC MISSING in Wiki "preserveOriginal"
\src\test\test-files\solr\conf\schema.xml
preserveOriginal="1" is missing from the Wiki Page when defining the
filter
solr.WordDelimiterFilterFactory
From: http://marc.info/?l=solr-dev&m=121483672330304&w=2
"Geoffrey Young (JIRA)" <jira () apache ! org>
Date: 2008-06-30 14:37:45
When doing prefix searching, you need to hang on to the original term
otherwise
you'll miss many matches you should be making.
Data: ABC-12345
WordDelimiterFitler may change this into
ABC 12345 ABC12345
A user may enter a search such as
ABC\-123*
Which will fail to find a match given the above scenario.
The attached patch will allow the use of the "preserveOriginal" option
to
WordDelimiterFilter and will analyze as ABC 12345 ABC12345 ABC-12345
in which case we will get a positive match.
---------------------
15a - FAILED(3a) not sure if I should add these attributes to the
elements filter and
field.
apache-solr-1.3.0\src\test\test-files\solr\conf\schema.xml
Validating schema.xml...
schema.xml:287,89: Attribute 'name' is not declared for
element 'filter'
schema.xml:384,96: Attribute 'sortMissingFirst' is not declared for
element 'field'
The XML document schema.xml is NOT valid (2 errors)
Error the same as:
(apache-solr-1.3.0\src\test\test-files\solr\conf\schema-required-fields.
xml)
========================================================================
====
I can send this in a different format, perhaps a zip file if you wish.
Peter
schema.xsd
<?xml version="1.0" encoding="UTF-8"?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
elementFormDefault="qualified">
<xs:annotation>
<xs:documentation xml:lang="EN">
Please see the solr wiki for complete details of
the elements and
attributes defined in this file.
For more information, on how to customize this
file, please see
http://wiki.apache.org/solr/SchemaXml
To learn about XMLSchema files, there is a
primer available at:
http://www.w3.org/TR/xmlschema-0/
This Extensible XML Schema represents the
definition's of the Solr
Schema file elements and attributes. The Solr
Schema file is used
within the Solr product to define the
relationships of fields to
correctly index and search the data in the
Lucene index.
Since the Solr Product is extensible in many
ways if you create your
own filter, and define parameters names for the
filter that have not
previously been defined as filter attributes.
Then you will need
to add those attribute names to the filters area
"filterAttributeGroup"
within this file for your schema file to
validate correctly.
Created: November 2008
</xs:documentation>
</xs:annotation>
<xs:simpleType name="logicalConjunction">
<xs:restriction base="xs:string">
<xs:enumeration value="AND"/>
<xs:enumeration value="OR"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType name="x01Type">
<xs:annotation>
<xs:documentation>
</xs:documentation>
</xs:annotation>
<xs:restriction base="xs:string">
<xs:pattern value="[0-1]"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType name="phonicFiltersType">
<xs:annotation>
<xs:documentation>For use with
org.apache.lucene.analysis.PhoneticFilter</xs:documentation>
</xs:annotation>
<xs:restriction base="xs:string">
<xs:enumeration value="DoubleMetaphone"/>
<xs:enumeration value="Metaphone"/>
<xs:enumeration value="Soundex"/>
<xs:enumeration value="RefinedSoundex"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType name="porterStemmerlanguageType">
<xs:annotation>
<xs:documentation>For use with
org.apache.lucene.analysis.SnowballPorterFilter</xs:documentation>
</xs:annotation>
<xs:restriction id="langList" base="xs:string">
<xs:enumeration value="Danish"/>
<xs:enumeration value="Dutch"/>
<xs:enumeration value="English"/>
<xs:enumeration value="Finnish"/>
<xs:enumeration value="French"/>
<xs:enumeration value="German2"/>
<xs:enumeration value="German"/>
<xs:enumeration value="Italian"/>
<xs:enumeration value="Kp"/>
<xs:enumeration value="Lovins"/>
<xs:enumeration value="Norwegian"/>
<xs:enumeration value="Porter"/>
<xs:enumeration value="Portuguese"/>
<xs:enumeration value="Russian"/>
<xs:enumeration value="Spanish"/>
<xs:enumeration value="Swedish"/>
</xs:restriction>
</xs:simpleType>
<xs:attributeGroup name="fieldtypeAttributesGroup">
<xs:attribute name="class" type="xs:NCName"
use="required"/>
<!--
Field types that store text (TextField, StrField)
support
compression of stored content
-->
<xs:attribute name="compressed" type="xs:boolean"/>
<!--
compressThreshold is the minimum length required for
text
compression to be invoked. This applies only if
compressed=true;
a common pattern is to set compressThreshold on the
field type
definition, and turn compression on and off in the
individual
field definitions.
-->
<xs:attribute name="compressThreshold"
type="xs:integer"/>
<!--
used for class="solr.ExternalFileField"
-->
<xs:attribute name="defVal" type="xs:string"/>
<!--
-->
<xs:attribute name="id" type="xs:ID" use="optional"/>
<!--
-->
<xs:attribute name="indexed" type="xs:boolean"
use="optional"/>
<!--
-->
<!--
used for class="solr.ExternalFileField"
-->
<xs:attribute name="keyField" type="xs:string"
use="optional"/>
<xs:attribute name="multiValued" type="xs:boolean"
use="optional"/>
<!--
-->
<xs:attribute name="name" type="xs:NCName"
use="required"/>
<!--
-->
<xs:attribute name="omitNorms" type="xs:boolean"
use="optional"/>
<!--
-->
<xs:attribute name="positionIncrementGap"
type="xs:nonNegativeInteger" use="optional"/>
<!--
-->
<xs:attribute name="sortMissingFirst" type="xs:boolean"
use="optional"/>
<!--
-->
<xs:attribute name="sortMissingLast" type="xs:boolean"
use="optional"/>
<!--
-->
<xs:attribute name="stored" type="xs:boolean"
use="optional"/>
<!--
-->
<xs:attribute name="termPositions" type="xs:boolean"
use="optional"/>
<!--
-->
<xs:attribute name="termVectors" type="xs:boolean"
use="optional"/>
<!--
used for class="solr.ExternalFileField"
-->
<xs:attribute name="valType" type="xs:string"
use="optional"/>
</xs:attributeGroup>
<xs:attributeGroup name="filterAttributeGroup">
<!--
The "class" attribute is required for all filters.
-->
<xs:attribute name="class" type="xs:NCName"
use="required"/>
<!--
The "catenateAll" attribute is required for
"WordDelimiterFilterFactory" filters.
-->
<xs:attribute name="catenateAll" type="x01Type"
use="optional"/>
<!--
The "catenateNumbers" attribute is required for
"WordDelimiterFilterFactory" filters.
-->
<xs:attribute name="catenateNumbers" type="x01Type"
use="optional"/>
<!--
The "catenateWords" attribute is required for
"WordDelimiterFilterFactory" filters.
-->
<xs:attribute name="catenateWords" type="x01Type"
use="optional"/>
<!--
The "enablePositionIncrements" attribute is required for
"StopFilterFactory" filters.
-->
<xs:attribute name="enablePositionIncrements"
type="xs:boolean" use="optional"/>
<!--
The "encoder" attribute is required for
"PhoneticFilterFactory" filters.
-->
<xs:attribute name="encoder" type="phonicFiltersType"
use="optional"/>
<!--
The "expand" attribute is required for
"SynonymFilterFactory" filters.
-->
<xs:attribute name="expand" type="xs:boolean"
use="optional"/>
<!--
The "generateNumberParts" attribute is required for
"WordDelimiterFilterFactory" filters.
-->
<xs:attribute name="generateNumberParts" type="x01Type"
use="optional"/>
<!--
The "generateWordParts" attribute is required for
"WordDelimiterFilterFactory" filters.
-->
<xs:attribute name="generateWordParts" type="x01Type"
use="optional"/>
<!--
The "id" attribute is required for "" filters.
-->
<xs:attribute name="id" type="xs:ID" use="optional"/>
<!--
The "ignoreCase" attribute is optional for the
"StopFilterFactory, SynonymFilterFactory".
-->
<xs:attribute name="ignoreCase" type="xs:boolean"
use="optional"/>
<!--
The "inject" attribute is required for
"PhoneticFilterFactory" filters.
-->
<xs:attribute name="inject" type="xs:boolean"
use="optional"/>
<!--
The "language" attribute is required for
"SnowballPorterFilterFactory" filters.
-->
<xs:attribute name="language"
type="porterStemmerlanguageType" use="optional"/>
<!--
The "max" attribute is required for the
"LengthFilterFactory" filters.
-->
<xs:attribute name="max" type="xs:nonNegativeInteger"
use="optional"/>
<!--
The "maxShingleSize" attribute is required for the
"ShingleFilterFactory" filters.
-->
<xs:attribute name="maxShingleSize"
type="xs:nonNegativeInteger" default="2" use="optional"/>
<!--
The "min" attribute is required for the
"LengthFilterFactory" filters.
-->
<xs:attribute name="min" type="xs:nonNegativeInteger"
use="optional"/>
<!--
The "outputUnigrams" attribute is required for
"ShingleFilterFactory" filters.
-->
<xs:attribute name="outputUnigrams" type="xs:boolean"
use="optional"/>
<!--
The "pattern" attribute is required for
"PatternTokenizerFactory" filters.
-->
<xs:attribute name="pattern" type="xs:string"
use="optional"/>
<!--
solr.WordDelimiterFilterFactory new feature in
Add the ability to preserve the original term when
using WordDelimiterFilter
-->
<xs:attribute name="preserveOriginal" type="x01Type"
use="optional"/>
<!--
The "protected" attribute is required for
"EnglishPorterFilterFactory" filters.
-->
<xs:attribute name="protected" type="xs:NCName"
use="optional"/>
<!--
The "replace" attribute is required for "" filters.
-->
<xs:attribute name="replace" type="xs:NCName"
use="optional"/>
<!--
The "replacement" attribute is required for "" filters.
-->
<xs:attribute name="replacement" type="xs:string"
use="optional"/>
<!--
The "splitOnCaseChange" attribute is required for
"WordDelimiterFilter " filters.
-->
<xs:attribute name="splitOnCaseChange" type="x01Type"
use="optional"/>
<!--
The "synonyms" attribute is required for
"SynonymFilterFactory" filters.
-->
<xs:attribute name="synonyms" type="xs:NCName"
use="optional"/>
<!--
The "updateOffsets" attribute is optional for
"TrimFilterFactory" filters.
-->
<xs:attribute name="updateOffsets" type="xs:boolean"
use="optional"/>
<!--
The "words" attribute is optional for
"StopFilterFactory" filters.
default words will be used if not specified.
-->
<xs:attribute name="words" type="xs:NCName"
use="optional"/>
</xs:attributeGroup>
<xs:attributeGroup name="fieldAttributeGroup">
<xs:attribute name="default" type="xs:NMTOKEN"/>
<xs:attribute name="compressed" type="xs:boolean"/>
<xs:attribute name="compressThreshold"
type="xs:integer"/>
<xs:attribute name="id" type="xs:ID"/>
<xs:attribute name="indexed" type="xs:boolean"/>
<xs:attribute name="multiValued" type="xs:boolean"/>
<xs:attribute name="name" use="required"
type="xs:string"/>
<xs:attribute name="omitNorms" type="xs:boolean"/>
<xs:attribute name="required" type="xs:boolean"/>
<xs:attribute name="stored" type="xs:boolean"/>
<xs:attribute name="termOffsets" type="xs:boolean"/>
<xs:attribute name="termPositions" type="xs:boolean"/>
<xs:attribute name="termVectors" type="xs:boolean"/>
<xs:attribute name="type" use="required"
type="xs:string"/>
</xs:attributeGroup>
<xs:element name="schema">
<xs:complexType>
<xs:sequence>
<xs:element ref="types"/>
<xs:element ref="fields"/>
<xs:choice maxOccurs="unbounded">
<xs:element maxOccurs="1"
ref="defaultSearchField"/>
<xs:element maxOccurs="1"
ref="uniqueKey"/>
</xs:choice>
<xs:element minOccurs="0"
ref="solrQueryParser"/>
<xs:element minOccurs="0"
maxOccurs="unbounded" ref="copyField"/>
<xs:element ref="similarity"
minOccurs="0" maxOccurs="1"/>
</xs:sequence>
<xs:attribute name="id" type="xs:ID"/>
<xs:attribute name="name" use="required"
type="xs:string"/>
<xs:attribute name="version" use="required"
type="xs:decimal"/>
</xs:complexType>
</xs:element>
<xs:element name="types">
<xs:complexType>
<xs:choice maxOccurs="unbounded">
<!-- Both elements fieldType and fieldtype
are the same -->
<xs:element maxOccurs="unbounded"
ref="fieldType"/>
<xs:element maxOccurs="unbounded"
ref="fieldtype"/>
</xs:choice>
<xs:attribute name="id" type="xs:ID"/>
</xs:complexType>
</xs:element>
<!-- Both elements fieldType and fieldtype are the same -->
<xs:element name="fieldType" type="fieldTypeORfieldtype"/>
<xs:element name="fieldtype" type="fieldTypeORfieldtype"/>
<xs:complexType name="fieldTypeORfieldtype">
<xs:sequence>
<xs:element minOccurs="0" maxOccurs="unbounded"
ref="analyzer"/>
</xs:sequence>
<xs:attributeGroup ref="fieldtypeAttributesGroup"/>
</xs:complexType>
<xs:element name="analyzer">
<xs:complexType>
<xs:sequence minOccurs="0">
<xs:element ref="tokenizer"/>
<xs:element minOccurs="0"
maxOccurs="unbounded" ref="filter"/>
</xs:sequence>
<xs:attribute name="class" type="xs:string"/>
<xs:attribute name="id" type="xs:ID"/>
<xs:attribute name="type" type="xs:NCName"/>
</xs:complexType>
</xs:element>
<xs:element name="tokenizer">
<xs:complexType>
<xs:attribute name="class" use="required"
type="xs:NCName"/>
<xs:attribute name="id" type="xs:ID"/>
</xs:complexType>
</xs:element>
<xs:element name="filter">
<xs:complexType>
<xs:attributeGroup ref="filterAttributeGroup"/>
</xs:complexType>
</xs:element>
<xs:element name="fields">
<xs:complexType>
<xs:sequence>
<xs:element maxOccurs="unbounded"
ref="field"/>
<xs:element maxOccurs="unbounded"
minOccurs="0" ref="dynamicField"/>
</xs:sequence>
<xs:attribute name="id" type="xs:ID"/>
</xs:complexType>
</xs:element>
<xs:element name="field">
<xs:complexType>
<xs:attributeGroup ref="fieldAttributeGroup"/>
</xs:complexType>
</xs:element>
<xs:element name="dynamicField">
<xs:complexType>
<xs:attributeGroup ref="fieldAttributeGroup"/>
</xs:complexType>
</xs:element>
<xs:element name="uniqueKey" type="xs:NCName"/>
<xs:element name="defaultSearchField" type="xs:NCName"/>
<xs:element name="solrQueryParser">
<xs:complexType>
<xs:attribute name="defaultOperator"
use="optional" type="logicalConjunction" default="OR"/>
<xs:attribute name="id" type="xs:ID"/>
</xs:complexType>
</xs:element>
<xs:element name="copyField">
<xs:complexType>
<xs:attribute name="dest" use="required"
type="xs:string"/>
<xs:attribute name="id" type="xs:ID"/>
<xs:attribute name="source" use="required"
type="xs:string"/>
</xs:complexType>
</xs:element>
<xs:element name="similarity">
<xs:complexType>
<xs:sequence minOccurs="0">
<!--
org.apache.solr.schema.CustomSimilarityFactory -->
<xs:element name="str">
<xs:complexType mixed="true">
<xs:attribute name="name"
type="xs:string"/>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="class" use="required"
type="xs:NCName"/>
<xs:attribute name="id" type="xs:ID"/>
</xs:complexType>
</xs:element>
</xs:schema>
