Convert between binary file and XML

An experiment in FDFL style data conversion

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:data="http://www.datamech.com/storage">

<xsd:annotation>
    <xsd:documentation xml:lang="en">   
    Purchase order schema for Example.com.
    Copyright 2000 Example.com. All rights reserved.
    </xsd:documentation>
    <xsd:appinfo>   
      <data:format optionPresent="P" optionAbsent="A"/>
    </xsd:appinfo>
  </xsd:annotation>
  
  <xsd:element name="purchaseOrder" type="PurchaseOrderType"/>
  <xsd:element name="comment" type="xsd:string"/>
  <xsd:complexType name="PurchaseOrderType">
    <xsd:sequence>
      <xsd:element name="shipTo" type="USAddress">
        <xsd:annotation>
          <xsd:documentation xml:lang="en">
            Ship the purchase to this address
          </xsd:documentation>
        </xsd:annotation>
      </xsd:element>
      <xsd:element name="billTo" type="USAddress" nillable="true">
        <xsd:annotation>
          <xsd:documentation xml:lang="en">
            Bill the purchase to this address
          </xsd:documentation>
        </xsd:annotation>
      </xsd:element>
      <xsd:element ref="comment" minOccurs="0"/>
      <xsd:element name="items" type="Items"/>
    </xsd:sequence>
    <xsd:attribute name="orderDate" type="xsd:date"/>
  </xsd:complexType>

<xsd:complexType name="USAddress">
    <xsd:annotation>
      <xsd:documentation xml:lang="en">
        the address type for USA
        Should always has country="US"
        Other fields are name, street, city, state and zip code
      </xsd:documentation>
    </xsd:annotation>
    <xsd:sequence>
      <xsd:element name="name" type="xsd:string" data:dataCounter="xsd:unsignedByte"/>;
      <xsd:choice>
        <xsd:element name="street" data:choiceTag="S" data:dataCounter="xsd:nonNegativeInteger" data:dataCounterDigits="xsd:maxLength">;
          <xsd:simpleType>
            <xsd:restriction base="xsd:string">
              <xsd:maxLength value="40"/>
            </xsd:restriction>
          </xsd:simpleType>
        </xsd:element>
        <xsd:element name="poBox" type="xsd:int" data:choiceTag="P"/>
      </xsd:choice>
      <xsd:element name="city" data:dataCounter="" data:fieldWidth="xsd:maxLength">
        <xsd:simpleType>
          <xsd:restriction base="xsd:string">
            <xsd:maxLength value="20"/>
          </xsd:restriction>
        </xsd:simpleType>
      </xsd:element>
      <xsd:element name="state">
        <xsd:simpleType>
          <xsd:restriction base="xsd:string">
            <xsd:length value="2"/>
          </xsd:restriction>
        </xsd:simpleType>
      </xsd:element>
      <xsd:element name="zip" type="xsd:decimal"/>
    </xsd:sequence>
    <xsd:attribute fixed="US" name="country" type="xsd:NMTOKEN"/>
  </xsd:complexType>
  
  <xsd:complexType name="Items">
    <xsd:sequence>
      <xsd:element maxOccurs="unbounded" minOccurs="0" name="item" data:itemCounter="EOF">
        <xsd:annotation>
          <xsd:documentation xml:lang="en">
            Item purchased
          </xsd:documentation>
        </xsd:annotation>
        <xsd:complexType>
          <xsd:annotation>
            <xsd:documentation xml:lang="en">
              Information includes part number, product name, quantity,
              price, comment(optional), ship date(optional)
            </xsd:documentation>
          </xsd:annotation>
          <xsd:sequence>
            <xsd:element name="productName" type="xsd:string"/>
            <xsd:element name="quantity">
              <xsd:annotation>
                <xsd:documentation xml:lang="en">
                  How many was ordered
                </xsd:documentation>
              </xsd:annotation>
              <xsd:simpleType>
                <xsd:annotation>
                  <xsd:documentation xml:lang="en">
                    must be between 1 and 99
                  </xsd:documentation>
                </xsd:annotation>
                <xsd:restriction base="xsd:positiveInteger">
                  <xsd:maxExclusive value="100"/>
                  <xsd:totalDigits value="2"/>
                </xsd:restriction>
              </xsd:simpleType>
            </xsd:element>
            <xsd:element name="USPrice" type="xsd:decimal"/>
            <xsd:element ref="comment" minOccurs="0"/>
            <xsd:element minOccurs="0" name="shipDate" type="xsd:date"/>
          </xsd:sequence>
          <xsd:attribute use="required" name="partNum" type="SKU">
            <xsd:annotation>
              <xsd:documentation xml:lang="en">
                The part number of the product
              </xsd:documentation>
            </xsd:annotation>
          </xsd:attribute>
        </xsd:complexType>
      </xsd:element>
    </xsd:sequence>
  </xsd:complexType>
  
  
  <xsd:simpleType name="SKU">
    <xsd:annotation>
      <xsd:documentation xml:lang="en">
        Stock Keeping Unit, a code for identifying products.
        It should be in the form ddd-xx
      </xsd:documentation>
    </xsd:annotation>
    <xsd:restriction base="xsd:string">
      <xsd:pattern value="\d{3}-[A-Z]{2}"/>
    </xsd:restriction>
  </xsd:simpleType>
</xsd:schema>

The binary data source file:
Data will be in binary hexadecimal printable text
Data converted from XML to binary from binary to XML
Data output plain text converter textbox XML form generator textbox
Debugging off on

The following allows you to quickly modify the first appinfo data format of the schema

is suggested value:

String length determined by
null termination
One byte counter
Two bytes counter
Four bytes counter
Numeric string counter

Item count determined by
One byte counter
Two bytes counter
Four bytes counter
Numeric string counter

More information about the data conversion.