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<?xml version='1.0' encoding='UTF-8'?>
<!--
* Copyright 2002-2004 The Apache Software Foundation.
*
* Licensed 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.
-->
<!DOCTYPE s1 SYSTEM 'dtd/document.dtd'>
<s1 title="XML Schema">
<s2 title="Introduction">
<p>This package contains an implementation of the W3C XML
Schema Language, a recommendation of the Worldwide Web Consortium
available in three parts:
<jump href="http://www.w3.org/TR/XMLSchema-0">XML Schema: Primer</jump> and
<jump href="http://www.w3.org/TR/XMLSchema-1">XML Schema: Structures</jump> and
<jump href="http://www.w3.org/TR/XMLSchema-2">XML Schema: Datatypes</jump>.
We consider this implementation to be complete except for the
limitations cited below. The implementation has been
extensively tested and known problem areas are set out below.
In this document we also discuss our interpretation of the
specifications where it seems to us particularly likely that
others might arrive at a different interpretation.
Please read this document before using this package.
</p>
</s2>
<s2 title="XML Schema Programmer's Guide">
<p>This section provides the following topics:</p>
<ul>
<li><jump href='#schema-limitations'>Limitations and known bugs</jump></li>
<li><link idref='faq-xs'>How do I?</link> --
the most frequently asked questions
about XML Schema that include some sample code.</li>
</ul>
</s2>
<anchor name='schema-limitations'/>
<s2 title="Limitations">
<ul>
<li> Length, minLength, and maxLength facets are limited to the value
2147483647. Items larger than this limit will not be validated
correctly.</li>
<li> The values of minOccurs and maxOccurs attributes are limited to
the value 2147483647. Items larger than this limit will not be
validated correctly.</li>
<li> The values of minimum and maximum quantifiers in the pattern
regular expressions are limited to the value 2147483647.
Items larger than this limit will not be validated correctly.</li>
<li> The absolute values of the fraction portion of the second values
in date/time datatypes are limited to the value 2147483647.
Items larger than this limit will not be validated correctly.
i.e. 11.2147483648 is not supported as a second value. </li>
</ul>
</s2>
<s2 title='Problem Areas/Known Bugs'>
<ul>
<li> For larger values of maxOccurs, an OutOfMemoryError may occur.
The workaround for this problem, if your application permits it,
is to change the maxOccurs value to unbounded.</li>
</ul>
</s2>
<s2 title="Other Notes">
<ul>
<li> As of version 2.2.1, it is hoped that Xerces-J will always
be able to parse the Schema for Schemas current at the time of the product's release. As of version
2.2.1, this implies inserting special logic to permit the presence of
the built-in Schema datatypes in this particular schema; an
issue has been raised with the Schema Working Group, in hopes the document
will be modified so that the built-in types are no
longer presented as global components. Thus, anyone planning
to rely on the Schema for Schemas should be aware that the
possibility exists that a change of this sort might be made in the future.</li>
<li> In the original XML Schema recommendation, the lexical space of
the simple type <code>gMonth</code> is <code>--MM--</code>. An erratum E2-12
changed that to <code>--MM</code>. For compatibility reasons, Xerces currently
supports both forms. To align with the recommendation, we have decided to
deprecate the old form, and plan to discontinue support for that form
in a future release. </li>
</ul>
</s2>
</s1>
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