The primary use case for stopValue isn't like the one here. It's from big
numeric data sets where they often use a distinguished value to indicate the
end of an array.
One reason stop values aren't implemented is that there are so many
alternatives to it.
For example:
<xs:element name="input">
<xs:complexType>
<xs:sequence dfdl:separator="%NL;----%NL;"
dfdl:separatorPosition="infix">
<xs:sequence dfdl:separator="%NL;" dfdl:separatorPosition="infix">
<xs:element name="fruit" type="xs:string"
maxOccurs="unbounded"
dfdl:lengthKind="delimited"
dfdl:occursCountKind="parsed">
</xs:element>
</xs:sequence>
<xs:sequence dfdl:separator="%NL;" dfdl:separatorPosition="infix">
<xs:element name="wood" type="xs:string"
maxOccurs="unbounded"
dfdl:lengthKind="delimited"
dfdl:occursCountKind="parsed">
</xs:element>
</xs:sequence>
<xs:sequence dfdl:separator="%NL;" dfdl:separatorPosition="infix">
<xs:element name="color" type="xs:string"
maxOccurs="unbounded"
dfdl:lengthKind="delimited"
dfdl:occursCountKind="parsed" />
</xs:sequence>
</xs:sequence>
</xs:complexType>
</xs:element>
When there is more than one terminating delimiter in scope, DFDL rules are
"longest match wins", so the
outer separator NL----NL wins over just NL.
________________________________
From: Costello, Roger L. <[email protected]>
Sent: Tuesday, July 23, 2019 2:51:21 PM
To: [email protected] <[email protected]>
Subject: Re: Can't have an array of arrays?
Thank you Brandon!
Upon experimentation, I found that Daffodil does not currently support
dfdl:occursCountKind="stopValue"
Daffodil team: when will stopValue be supported?
Your other suggestion works great:
<xs:element name="input">
<xs:complexType>
<xs:sequence dfdl:separator="%NL;"
dfdl:separatorPosition="infix">
<xs:element name="fruit" type="xs:string"
maxOccurs="unbounded"
dfdl:occursCountKind="parsed">
<xs:annotation>
<xs:appinfo source="http://www.ogf.org/dfdl/";>
<dfdl:assert test="{. ne '----'}" />
</xs:appinfo>
</xs:annotation>
</xs:element>
<xs:sequence dfdl:hiddenGroupRef="separatorGroup" />
<xs:element name="wood" type="xs:string"
maxOccurs="unbounded"
dfdl:occursCountKind="parsed">
<xs:annotation>
<xs:appinfo source="http://www.ogf.org/dfdl/";>
<dfdl:assert test="{. ne '----'}" />
</xs:appinfo>
</xs:annotation>
</xs:element>
<xs:sequence dfdl:hiddenGroupRef="separatorGroup" />
<xs:element name="color" type="xs:string"
maxOccurs="unbounded"
dfdl:occursCountKind="implicit" />
</xs:sequence>
</xs:complexType>
</xs:element>
From: Sloane, Brandon <[email protected]>
Sent: Tuesday, July 23, 2019 2:23 PM
To: [email protected]
Subject: [EXT] Re: Can't have an array of arrays?
In your case, I believe you want to use dfdl:occursCountKind="stopValue".
I am not 100% sure this feature is implemented in Daffodil yet. If not, you
would want to use dfdl:occursCountKind="parsed", and put an assert on each of
your types that they are not the value "----"
________________________________
From: Costello, Roger L. <[email protected]<mailto:[email protected]>>
Sent: Tuesday, July 23, 2019 2:08:18 PM
To: [email protected]<mailto:[email protected]>
<[email protected]<mailto:[email protected]>>
Subject: Can't have an array of arrays?
Hello DFDL community,
My input contains an array of fruit values, separator, array of wood values,
separator, and an array of color values:
Apple
Banana
Orange
Watermelon
Grapes
Cantaloupe
----
Oak
Pine
Maple
----
Red
Green
Purple
Blue
I thought this DFDL schema would do the trick:
<xs:element name="input">
<xs:complexType>
<xs:sequence dfdl:separator="%NL;" dfdl:separatorPosition="infix">
<xs:element name="fruit" type="xs:string" maxOccurs="unbounded"
dfdl:occursCountKind="implicit" />
<xs:sequence dfdl:hiddenGroupRef="separatorGroup" />
<xs:element name="wood" type="xs:string" maxOccurs="unbounded"
dfdl:occursCountKind="implicit" />
<xs:sequence dfdl:hiddenGroupRef="separatorGroup" />
<xs:element name="color" type="xs:string" maxOccurs="unbounded"
dfdl:occursCountKind="implicit" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:group name="separatorGroup">
<xs:sequence>
<xs:element name="separator" type="xs:string">
<xs:annotation>
<xs:appinfo source="http://www.ogf.org/dfdl/";>
<dfdl:assert test="{. eq '----'}" />
</xs:appinfo>
</xs:annotation>
</xs:element>
</xs:sequence>
</xs:group>
Sadly, that produces this error:
[error] Schema Definition Error: occursCountKind='implicit' with unbounded
maxOccurs only allowed for last element of a positional sequence
What is the correct way to express an array of arrays?
/Roger
