How do I valid pattern for xsd restriction contain type float with word "exist"

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Hello,

i want to validate by xsd an attribute can contain a float type or a word "exist". after search in the net i found this solution(https://www.w3schools.com/xml/schema_facets.asp) but it does not worked.
how to fix that ?

What I have tried:

when i add this pattern it does not work:

XML

<xs:restriction base="xs:Double">
      <xs:pattern value="[0-9]| 'exist'"/>
    </xs:restriction>

Posted 13-Jun-22 0:16am

.Net Perfect Dev

Updated 13-Jun-22 6:46am

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ludosoep · Answer 1 · 2022-06-13T01:12:00

Solution 1

It is a little odd that a double type can hold the value "exist". The example you've sent actually describes pattern matching on a string type.

So it is either changing the type to string or define a double value that is considered equal to "exist", e.g. double.MinValue / double.MaxValue if you're using C#.

Sharing your use case or a xml snippet could definitely help in helping with the question btw!

Cheers

Posted 13-Jun-22 1:12am

ludosoep

Updated 13-Jun-22 1:13am

v2

Comments

.Net Perfect Dev 13-Jun-22 12:47pm

ok this is an exemple :
xml file:

<catalog>
<book id="bk101" price="12.30">
<book id="bk102" price="exist">

and this is the xsd file which i tried:

<xs:schema attributeformdefault="unqualified" elementformdefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="Catalog">
<xs:complextype>
<xs:sequence>
<xs:element maxoccurs="unbounded" name="Book">
<xs:complextype>
<xs:attribute name="id" type="xs:string" use="required">
<xs:attribute name="price" type="tprice" use="required">

<xs:simpletype name="tprice">
<xs:restriction base="xs:string">
<xs:pattern value="[0-9]| 'exist'">

ludosoep 13-Jun-22 16:15pm

Okay, so as Dave already mentioned below, it is not possible, or at least not when using the double type. You can use xs:string, but please keep in mind it is a textual value and not a numeric value.

So the only thing you seem to be missing is the . in your pattern and the single quotes that are obsolete. This simpleType should work:


	<xs:simpleType name="tprice">
		<xs:restriction base="xs:string">
			<xs:pattern value="[0-9\.]*|exist"/>
		</xs:restriction>
	</xs:simpleType>

The \. is to match the dot and the slash is to escape the dot, as this means "match all" in regex.

HTH. Cheers

.Net Perfect Dev · Answer 2 · 2022-06-13T06:46:00

ok this is an exemple :
xml file:

XML

<?xml version="1.0"?>
<Catalog>
   <Book id="bk101" price="12.30" />
   <Book id="bk102" price="exist" />
</Catalog>

and this is the xsd file which i tried:

XML

<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="Catalog">
    <xs:complexType>
      <xs:sequence>
        <xs:element maxOccurs="unbounded" name="Book">
          <xs:complexType>
            <xs:attribute name="id" type="xs:string" use="required" />
            <xs:attribute name="price" type="tprice" use="required" />
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:simpleType name="tprice">
    <xs:restriction base="xs:string">
      <xs:pattern value="[0-9]| 'exist'"/>
    </xs:restriction>
  </xs:simpleType>
</xs:schema>