My guess is that the default lengthKind is delimited and the default
fillByte is the zero character?
If this is the case, then RunwayDesignator_2 is delimited and no padding
will be output when unparsed.
But the parent RunwayDirectionDesignator element has an explicit length
of 7. So if its children (RunwayDesignator_1, _2, and the hyphen) don't
unparse to 7 characters then the remaining characters will be filled
with the fillByte. If your probably seeing zeros because fillByte="0".
The easiest fix is likely to just change the default fillByte to a
space, i.e.
fillByte="%SP;"
On 2024-01-19 09:56 AM, Roger L Costello wrote:
My input is a 7-character, fixed length field.
The field contains data about one or two airport runways, e.g.,
.../24L-36R/...
.../24L /...
The L and R are optional, so the field could be these:
.../24 /...
.../24-36 /...
My DFDL schema parses correctly and mostly unparses correctly, but for
that last example it adds two zeroes instead of two spaces on unparsing.
These:
.../24 /...
.../24-36 /...
parses to these:
<RunwayDesignator>24</RunwayDesignator>
<RunwayDirectionDesignator>
<RunwayDesignator_1>24</RunwayDesignator_1>
<RunwayDesignator_2>36</RunwayDesignator_2>
</RunwayDirectionDesignator>
And uparses to these:
.../24 /...
.../24-3600/...
Notice that spaces are properly added in the first case, but zeroes are
added in the second case. Why is that? Below is my DFDL.
<xs:choice>
<xs:elementname="RunwayDesignator"
type="RunwayDesignator_simpleType"
dfdl:lengthKind="explicit"
dfdl:length="7"
dfdl:textTrimKind="padChar"
dfdl:textPadKind="padChar"
dfdl:textStringPadCharacter="%SP;"
dfdl:textStringJustification="left">
<xs:annotation>
<xs:appinfosource=http://www.ogf.org/dfdl/ <http://www.ogf.org/dfdl/>>
<dfdl:assert>{ dfdl:checkConstraints(.) }</dfdl:assert>
</xs:appinfo>
</xs:annotation>
</xs:element>
<xs:elementname="RunwayDirectionDesignator"
dfdl:lengthKind="explicit"
dfdl:length="7">
<xs:complexType>
<xs:sequence>
<xs:elementname="RunwayDesignator_1"
type="RunwayDesignator_simpleType"
dfdl:lengthKind="pattern"
dfdl:lengthPattern=".*?(?=[-])"/>
<xs:sequencedfdl:hiddenGroupRef="hidden-Hyphen"/>
<xs:elementname="RunwayDesignator_2"
type="RunwayDesignator_simpleType"
dfdl:textTrimKind="padChar"
dfdl:textPadKind="padChar"
dfdl:textStringPadCharacter="%SP;"
dfdl:textStringJustification="left"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:choice>
