This topic covers the implementation details of TPhysicalSectionsBlobItem.

 

Scope: cpPhysicalSections.pas; class derived from TBlobItem. Prepared from the curated implementation supplied for this review on 2 October 2026.

 

Each Section holds display/file names, Enabled, UseOutputFilename, default dimension switches, dimensions, AllOtherPages and Rules. Rule IDs 1–16 map to internal slots 0–15; a missing indexed rule stops the read.

 

RuleType 1 reads range endpoints and direction; 2 reads FrontPages; 3 reads BackPages; 4 reads Signature and its direction. The Rules wrapper is dereferenced directly. Rule combination semantics require the page-selection consumer.

 

Notation and shared helper rules: Reading this reference.

 

XML identity and composition

 

Literal rec_type values emitted within these routines: TPhysicalPagesRule, TPhysicalPagesRules. Nested values may belong to child wrappers rather than this owner itself; the attribute entries below give their exact locations.

 

Exact XML fields and attributes

 

The paths below start at this record or property node. A slash identifies a child element; @ identifies an attribute. Curly braces mark a variable index or expression, not literal XML text. Initial values describe initialization; they do not establish what an omitted individual element does. The Implementation toggle below contains the supplied routines for exact branch order and conversions.

 

DisplayName

 

XML representation: The text of the DisplayName element.

 

Initial value: “A Physical Section” (TPhysicalSectionsBlobItem.Create).

 

Reading: Reads node.text into DisplayName when the record node exists.

 

Writing: Stores DisplayName whenever the writer reaches this field.

 

FileName

 

XML representation: The text of the FileName element.

 

Initial value: an empty string (TPhysicalSectionsBlobItem.Create).

 

Reading: Reads node.text into FileName when the record node exists.

 

Writing: Stores FileName whenever the writer reaches this field.

 

Enabled

 

XML representation: The text of the Enabled element.

 

Initial value: true (TPhysicalSectionsBlobItem.Create).

 

Reading: Converts the stored text to a boolean and assigns it to Enabled when the record node exists.

 

Writing: Stores true or false according to Enabled whenever the writer reaches this field.

 

UseOutputFilename

 

XML representation: The text of the UseOutputFilename element.

 

Initial value: true (TPhysicalSectionsBlobItem.Create).

 

Reading: Converts the stored text to a boolean and assigns it to UseOutputFilename when the record node exists.

 

Writing: Stores true or false according to UseOutputFilename whenever the writer reaches this field.

 

DefaultHeight

 

XML representation: The text of the DefaultHeight element.

 

Initial value: true (TPhysicalSectionsBlobItem.Create).

 

Reading: Converts the stored text to a boolean and assigns it to DefaultHeight when the record node exists.

 

Writing: Stores true or false according to DefaultHeight whenever the writer reaches this field.

 

DefaultWidth

 

XML representation: The text of the DefaultWidth element.

 

Initial value: true (TPhysicalSectionsBlobItem.Create).

 

Reading: Converts the stored text to a boolean and assigns it to DefaultWidth when the record node exists.

 

Writing: Stores true or false according to DefaultWidth whenever the writer reaches this field.

 

Height

 

XML representation: The text of the Height element.

 

Initial value: 0 (TPhysicalSectionsBlobItem.Create).

 

Reading: Converts the stored text to a number and assigns it to Height when the record node exists.

 

Writing: Stores the text representation of Height whenever the writer reaches this field.

 

Width

 

XML representation: The text of the Width element.

 

Initial value: 0 (TPhysicalSectionsBlobItem.Create).

 

Reading: Converts the stored text to a number and assigns it to Width when the record node exists.

 

Writing: Stores the text representation of Width whenever the writer reaches this field.

 

AllOtherPages

 

XML representation: The text of the AllOtherPages element.

 

Initial value: false (TPhysicalSectionsBlobItem.Create).

 

Reading: Converts the stored text to a boolean and assigns it to AllOtherPages when the record node exists.

 

Writing: Stores true or false according to AllOtherPages whenever the writer reaches this field.

 

Rules/Rule[@id={(i + 1).toString}]/RuleType

 

XML representation: The text of the RuleType element.

 

Reading: Converts the stored text to a number and assigns it to Rules[i].RuleType when while node2 exists; node3 exists.

 

Writing: Stores the text representation of Rules[i].RuleType when for each i from low (TPhysicalPagesRules) through high (TPhysicalPagesRules); Rules[i].RuleType is one of [1..4].

 

Rules/Rule[@id={(i + 1).toString}]/RangeStart

 

XML representation: The text of the RangeStart element.

 

Reading: Converts the stored text to a number and assigns it to Rules[i].RangeStart when while node2 exists; Rules[i].RuleType is 1; node3 exists.

 

Writing: Stores the text representation of Rules[i].RangeStart when for each i from low (TPhysicalPagesRules) through high (TPhysicalPagesRules); Rules[i].RuleType is one of [1..4]; Rules[i].RuleType is 1.

 

Rules/Rule[@id={(i + 1).toString}]/RangeEnd

 

XML representation: The text of the RangeEnd element.

 

Reading: Converts the stored text to a number and assigns it to Rules[i].RangeEnd when while node2 exists; Rules[i].RuleType is 1; node3 exists.

 

Writing: Stores the text representation of Rules[i].RangeEnd when for each i from low (TPhysicalPagesRules) through high (TPhysicalPagesRules); Rules[i].RuleType is one of [1..4]; Rules[i].RuleType is 1.

 

Rules/Rule[@id={(i + 1).toString}]/RangeBackwards

 

XML representation: The text of the RangeBackwards element.

 

Reading: Converts the stored text to a boolean and assigns it to Rules[i].RangeBackwards when while node2 exists; Rules[i].RuleType is 1; node3 exists.

 

Writing: Stores true or false according to Rules[i].RangeBackwards when for each i from low (TPhysicalPagesRules) through high (TPhysicalPagesRules); Rules[i].RuleType is one of [1..4]; Rules[i].RuleType is 1.

 

Rules/Rule[@id={(i + 1).toString}]/FrontPages

 

XML representation: The text of the FrontPages element.

 

Reading: Converts the stored text to a number and assigns it to Rules[i].FrontPages when while node2 exists; Rules[i].RuleType is 2; node3 exists.

 

Writing: Stores the text representation of Rules[i].FrontPages when for each i from low (TPhysicalPagesRules) through high (TPhysicalPagesRules); Rules[i].RuleType is one of [1..4]; Rules[i].RuleType is 2.

 

Rules/Rule[@id={(i + 1).toString}]/BackPages

 

XML representation: The text of the BackPages element.

 

Reading: Converts the stored text to a number and assigns it to Rules[i].BackPages when while node2 exists; Rules[i].RuleType is 3; node3 exists.

 

Writing: Stores the text representation of Rules[i].BackPages when for each i from low (TPhysicalPagesRules) through high (TPhysicalPagesRules); Rules[i].RuleType is one of [1..4]; Rules[i].RuleType is 3.

 

Rules/Rule[@id={(i + 1).toString}]/Signature

 

XML representation: The text of the Signature element.

 

Reading: Converts the stored text to a number and assigns it to Rules[i].Signature when while node2 exists; Rules[i].RuleType is 4; node3 exists.

 

Writing: Stores the text representation of Rules[i].Signature when for each i from low (TPhysicalPagesRules) through high (TPhysicalPagesRules); Rules[i].RuleType is one of [1..4]; Rules[i].RuleType is 4.

 

Rules/Rule[@id={(i + 1).toString}]/SignatureBackwards

 

XML representation: The text of the SignatureBackwards element.

 

Reading: Converts the stored text to a boolean and assigns it to Rules[i].SignatureBackwards when while node2 exists; Rules[i].RuleType is 4; node3 exists.

 

Writing: Stores true or false according to Rules[i].SignatureBackwards when for each i from low (TPhysicalPagesRules) through high (TPhysicalPagesRules); Rules[i].RuleType is one of [1..4]; Rules[i].RuleType is 4.

 

Rules/@rec_type

 

XML representation: The rec_type attribute.

 

Writing: Stores the literal text “TPhysicalPagesRules” whenever the writer reaches this field.

 

Rules/Rule/@id

 

XML representation: The id attribute.

 

Writing: Stores the text representation of (i + 1) when for each i from low (TPhysicalPagesRules) through high (TPhysicalPagesRules); Rules[i].RuleType is one of [1..4].

 

Rules/Rule[@id={(i + 1).toString}]/@rec_type

 

XML representation: The rec_type attribute.

 

Writing: Stores the literal text “TPhysicalPagesRule” when for each i from low (TPhysicalPagesRules) through high (TPhysicalPagesRules); Rules[i].RuleType is one of [1..4].

 

Initialization and reset values

 

TPhysicalSectionsBlobItem.Create

 

 

This routine also calls inherited Create. See Implementation for their order and any conditional calls.

 

Storage declarations relevant to interpretation

 

These are in-memory member and property types, not a list of mandatory XML children. They retain array bounds, fixed buffers and selector types. The field reference above defines what is actually serialized.

 

 

Implementation details

 

The Implementation toggle contains only TPhysicalSectionsBlobItem methods. Initializers and helpers belonging to other types are identified separately below. Shared XML-helper limitations are explained in Reading this reference.

 

Implementation